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The RTCt-157 series ushers in a new era of precision and user-centricity in temperature calibration by offering a comprehensive feature set meticulously designed to improve your workflow. Wireless connectivity streamlines data transfer and facilitates remote monitoring, while innovative graphical presentations enhance clarity and expedite analysis.
The RTCt-157 series ushers in a new era of precision and user-centricity in temperature calibration by offering a comprehensive feature set meticulously designed to improve your workflow. Wireless connectivity streamlines data transfer and facilitates remote monitoring, while innovative graphical presentations enhance clarity and expedite analysis.
The RTCt-157 provides the optimal combination of exceptional accuracy, stability, and speed in the temperature range. The features and benefits of the popular RTC series are maintained in the RTCt series, to name a few:
Features
Designed for Versatility
Optimized Calibration Workflows
The RTCt temperature calibrator prioritizes user experience through innovative features that streamline workflows and empower technicians. This section details how the RTCt enhances calibration efficiency through user-defined setpoints, configurable interfaces, and intuitive data management.
User-Defined Setpoints for Streamlined Calibration
The RTCt provides enhanced control over your calibration process with its userdefined "Preset Temperatures" functionality. Define up to six custom temperature points to precisely match your specific sensor requirements. This eliminates the need for repetitive re-entries of often used calibration temperatures, which is streamlining workflow and maximizing efficiency.
User-Configurable Interface for Optimized Workflow
The RTCt surpasses traditional interfaces by offering a customizable user experience that adapts to your workflow. Leveraging the selectable User Interface (UI) feature, prioritize the information most critical for your tasks, minimizing distractions and enhancing focus. Tailor the interface to your preferences, ensuring intuitive and effortless execution of each calibration step. This results in a personalized calibration process that seamlessly integrates with your existing workflow.
Intuitive Data Management for Effortless Retrieval
The RTCt improves data management by introducing a user-definable data naming convention. Eliminate confusion from generic labels by implementing a system that reflects your unique calibration procedures. Assign meaningful names to your data sets, enabling effortless searching and retrieval. Say goodbye to time-consuming data mining and streamline your calibration workflow with the RTCt's intuitive data management capabilities.
Enhanced Connectivity and Wireless Capabilities
Unrestricted Calibration from Anywhere
The RTCt temperature calibrator's wireless connectivity empowers you to calibrate with unprecedented freedom and flexibility. With Wi-Fi capabilities, you can monitor and analyze calibration data in real-time through a web browser interface, from anywhere in your facility or even remotely. This wireless functionality eliminates the need to be physically present at the calibrator, saving time and ensuring efficient calibration processes.
Effortless Remote Management via Web Interface
For wireless connectivity, the RTCt includes a Wi-Fi dongle, allowing cable-free operation and remote access. This Wi-Fi connection enhances workflow automation, reduces setup constraints, and ensures seamless integration into your calibration environment.
Enhance Versatility through Diverse Communication Standards
The RTCt caters to various connectivity needs by supporting a wide range of communication standards, including Wi-Fi, Ethernet, and USB. This comprehensive offering ensures seamless integration with existing systems, regardless of their communication protocol.
Simplified Integration with User-Friendly Communication Protocols
Seamlessly integrate the RTCt into your existing systems with open communication protocols, ensuring flexibility across industries such as pharmaceutical, food & beverage, energy, and manufacturing. The RTCt supports ASCII-based protocol, making integration effortless across various platforms.
By offering open protocols, the RTCt eliminates compatibility challenges, allowing for smooth automation, remote control, and data exchange with external systems.
RTCt Series – Reliable Calibration with Complete Peace of Mind
See Every Detail. Trust Every Result. Calibrate with Confidence.
When precision matters, you need more than just numbers—you need visual proof that your calibration is accurate, stable, and reliable. The RTCt Series Temperature Calibrators provide real-time dynamic graphing and patented innovations that make it easier than ever to verify accuracy, detect deviations, and ensure full compliance.
Exclusive Real-Time Calibration Graph – Patent Pending
Traditional calibrators can plot temperature over time, but they don’t adapt dynamically. The RTCt Series introduces the first-ever real-time graphing system that adjusts automatically based on calibration stability.
Precision Switch Testing – Clear, Reliable, and Fully Documented
Temperature switches are critical for safety, system control, and process reliability. Ensuring they activate at the correct setpoints is essential to prevent false alarms, avoid equipment failures, and minimize costly downtime. The RTCt Series takes switch testing to the next level with an advanced, highly visual switch test display, delivering instant clarity, precision, and comprehensive documentation.
Switch Testing Made Clear and Reliable
The RTCt displays both the switch test graph and the test results table simultaneously. The graph plots switch activation points over time, making it easy to detect drift, response delays, or anomalies. The table logs exact activation and deactivation temperatures, ensuring precise traceability.
Understanding switch behavior isn’t just about activation temperature; it’s also about how consistently it triggers under repeated cycles. The RTCt makes it simple to see:
Hysteresis – The difference between activation and reset points.
Switch consistency – Does it switch at the same temperature every time?
Documentation at the Push of a Button
With built-in print screen functionality, all displayed information—including graphs, test results, and activation trends—can be instantly documented for audits, compliance, and traceability.
The RTCt’s advanced switch test display transforms temperature switch verification into a clear, reliable, and fully traceable process—helping users enhance safety, reduce downtime, and optimize operational efficiency.
Precision Calibration through Dual-Zone and DLC Technology
The RTCt-156 and RTCt-157 models set new standards for precision and uniformity in temperature calibration, thanks to AMETEK’s proprietary Dual-Zone Heating Technology, Dual-Sensor calibration, and Dynamic Load Compensation (DLC) system. These advancements work together to ensure unparalleled temperature stability across the calibration zone, supporting complex and high-accuracy calibration needs.
Active Dual-Zone Heating Technology
This innovative feature allows independent control over two heating zones within the calibration block, providing a precisely regulated environment. By maintaining consistent temperatures across both zones, the calibrator can minimize temperature gradients, even with variable sensor sizes or types. This technology is particularly valuable in applications where uniformity is critical, such as pharmaceuticals and quality control laboratories.
The RTCt Series can perform calibration over a very wide temperature range starting from -57°C and up to 155°C (-71 to 311°F). This makes it possible to perform calibration jobs over a range of 219° C (382° F). See full specifications page 16 of the datasheet.
Dual-Sensor Input for Parallel Calibration
The RTCt-156 and RTCt-157 empowers users to simultaneously calibrate two sensors, significantly boosting efficiency and productivity. This dual-input system eliminates the need for sequential calibration, allowing for parallel processes that streamline workflows and reduce downtime.
Patented Dynamic Load Compensation (DLC)
The DLC system dynamically adjusts for any thermal inconsistencies that may arise from different sensor loads or large sensor arrays. By continuously monitoring and compensating for load variations, DLC technology creates an exceptionally homogeneous temperature field. This capability allows for ‘close-to-laboratory’ performance, even in challenging industrial settings where diverse sensors are calibrated simultaneously
DLC Indicator for Real-Time Monitoring
The RTCt screen features a Dynamic Load Compensation (DLC) indicator, providing instant feedback on calibration stability. Users can set custom DLC values, ensuring precise control over load compensation.
The DLC status is clearly displayed in three formats:
Enhanced Precision for Large or Multiple Sensors
The combination of dual-zone control and DLC technology makes the RTCt-156 and RTCt-157 ideal for calibrating large sensors or multiple sensors in a single run. By maintaining uniform heat distribution, these calibrators ensure that each sensor experiences the same stable temperature, regardless of load or configuration, leading to faster calibration and greater confidence in the results.
Why Dual-Zone and DLC Matter
These technologies address common issues like temperature inhomogenity and uneven sensor heating, which can lead to errors in calibration results. With DualZone and DLC, the RTCt-156 and RTCt-157 provide a level of stability and accuracy that meets even the most stringent industry standards, from EURAMET guidelines to specific regulatory requirements. This makes them invaluable tools for industries where accurate, repeatable calibration is essential, enabling users to achieve highquality outcomes that support compliance and operational excellence.
The RTCt-156 and RTCt-157 temperature calibrators come equipped with specialized features that enhance their precision, versatility, and ease of use. These include intelligent reference sensors, uniquely designed sensors for varied applications, and multi-hole insert kits, all of which contribute to efficient and reliable calibration for a diverse range of sensor types and sizes.
Intelligent Reference Sensors for Seamless Accuracy
Each intelligent reference sensor stores its calibration data directly within the sensor itself, enabling true plug-and-play calibration. By automatically communicating its unique calibration coefficients to the RTCt unit, the sensor minimizes setup time, reduces error potential, and simplifies recalibration workflows. This innovation ensures every calibration is precise and traceable, supporting compliance with rigorous industry standards and reducing the need for manual data entry.
Unique Sensor Design for Enhanced Versatility
The STS-200 reference sensors and the DLC sensors have been specially designed. They are both angled 90˚ and have been customized to fit the calibrator so they are only slightly higher than the top of the RTC calibrator. The unique design makes it possible to calibrate threaded sensors and sensors with connection heads without any problems.
Multi-Hole Insert Kits for Adaptable Calibration
For users who frequently calibrate different sensor sizes, the multi-hole insert kits are an invaluable addition. Each kit includes a variety of pre-drilled inserts, covering the most common sensor diameters without requiring multiple individual inserts. Metric and imperial insert options are available, ensuring that each calibration session is efficient and hassle-free. The inserts are designed to accommodate both standard reference sensors and DLC sensors, offering a consistent temperature environment that maintains the homogeneity needed for high-precision calibrations.
The Benefits of Modular Accessories
These modular, user-friendly accessories make the RTCt-156 and RTCt-157 calibrators adaptable to almost any calibration setup. With intelligent sensors that self-configure, specially designed reference sensors for diverse installations, and flexible multi-hole inserts, these calibrators provide users with a highly versatile solution for accurate and streamlined temperature calibration.
| Funtional Specifications | |
| Temperature Range | At ambient temp. 32°F (0°C): -71 to 311°F (-57 to 155°C) At ambient temp. 73°F (23°C): -49 to 311°F (-45 to 155°C) At ambient temp. 104°F (40°C): -24 to 311°F (-31 to 155°C) |
| Accuracy with External STS Ref. Sensor (Models B and C) | RTCt-157 (model B and C): ±0.040°C/±0.072°F RTCt-156 (model B and C): ±0.065°C/±0.117°F |
| Accuracy with Internal Ref. Sensor (Models A, B, and C) | ±0.11°C/±0.2°F The RTCt Series follows rigorous metrological principles, ensuring that accuracy is reliable, repeatable, and fully traceable under documented conditions |
| Stability | ±0.005°C/±0.009°F Measured after the stability indicator has been on for 15 minutes. Measuring time is 30 minutes |
| Resolution | 1°, 0.1°, 0.01°, or 0.001° |
| Temperature Unit in Display | User Selectable: °C, °F, or K |
| Radial Homogeneity | 0.01°C/0.02°F at -32 °C/26 °F |
| Heating Time | -49 to 73°F (-45 to 23°C): 7 minutes 73 to 311°F (23 to 155°C): 17 minutes |
| Cooling Time | 311 to 212°F (155 to 100°C): 5 minutes 212 to 73°F (100 to 23°C): 10 minutes 73 to -22°F (23 to -30°C): 17 minutes -22 to -49°F (-30 to -45°C): 20 minutes 311 to -49°F (155 to -45°C): 52 minutes |
| Time to Stability | Approximately 10 minutes |
| Physical Specifications | |
| Dimensions | 14.3 x 6.7 x 14.3" (362 x 171 x 363 mm) |
| Weight | 22.7 lbs (10.3 kg) |
| Input Specifications | |
| RTD Reference Input (Models B and C) | Type: 4-wire RTD with true ohm measurement F.S. (Full Scale): 400 ohm Accuracy (12 months): ±(0.0012% rdg. + 0.0005% F.S.) Pt100(90)385 Reference: Temperature: -58°F (-50°C) / 12-Month Accuracy: ±0.026°F (±0.015°C) Temperature: 32°F (0°C) / 12-Month Accuracy: ±0.028°F (±0.016°C) Temperature: 311°F (155°C) / 12-Month Accuracy: ±0.035°F (±0.020°C) |
| DLC Sensor Input (Models B and C) | DLC-155: Temperature: -50°F (-58°C) / 12-Month Accuracy: ±0.024°F (±0.015°C) Temperature: 32°F (0°C) / 12-Month Accuracy: ±0.020°F (±0.012°C) Temperature: 311°F (155°C) / 12-Month Accuracy: ±0.016°F (±0.010°C) |
| RTD Sensor Under Test Input (Model B) | F.S. (range): 400 ohm Accuracy (12 months): ±(0.002% rdg. +0.001% F.S.) F.S. (range): 4000 ohm Accuracy (12 months): ±(0.003% rdg. + 0.003% F.S.) 2-wire: add 50 mOhm Pt100(90)385: Temperature: -50°F (-58°C)/12-Month Accuracy: ±0.026°F (±0.015°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.028°F (±0.016°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.035°F (±0.020°C) Pt500(90)385: Temperature: -50°F (-58°C)/12-Month Accuracy: ±0.120°F (±0.067°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.125°F (±0.070°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.139°F (±0.078°C) Pt1000(90)385: Temperature: -50°F (-58°C) / 12-Month Accuracy: ±0.066°F (±0.037°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.070°F (±0.039°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.081°F (±0.045°C) |
| Thermocouple Input | Range: -10 to 78 mV F.S. (Full Scale): 78 mV Accuracy (12 months): ±(0.005% Rdg. + 0.005% F.S.) Type E: Temperature: -58°F (-50°C)/12-Month Accuracy: ±0.14°F (±0.08°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.12°F (±0.07°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.12°F (±0.07°C) Type J: Temperature: -58°F (-50°C)/12-Month Accuracy: ±0.16°F (±0.09°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.14°F (±0.08°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.15°F (±0.08°C) Type K: Temperature: -58°F (-50°C)/12-Month Accuracy: ±0.21°F (±0.12°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.18°F (±0.10°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.19°F (±0.11°C) Type T: Temperature: -58°F (-50°C)/12-Month Accuracy: ±0.22°F (±0.12°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.19°F (±0.11°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.16°F (±0.09°C) Type R: Temperature: -58°F (-50°C)/12-Month Accuracy: ±1.91°F (±1.06°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±1.33°F (±0.74°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.86°F (±0.48°C) Type S: Temperature: -58°F (-50°C)/12-Month Accuracy: ±1.77°F (±0.98°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±1.31°F (±0.73°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.89°F (±0.50°C) Type N: Temperature: -58°F (-50°C)/12-Month Accuracy: ±0.30°F (±0.17°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.28°F (±0.16°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.24°F (±0.14°C) |
| Transmitter Supply | Output Voltage: 24 V DC ±10% Output Current: Maximum 28 mA |
| Transmitter Input mA (Model B) | Range: 0 to 24 mA Accuracy (12 months): ±(0.005% Rdg. +0.010% F.S.) |
| Voltage Input V DC (Model B) | Range: 0 to 12 V DC Accuracy (12 months): ±(0.005% Rdg. + 0.010% F.S.) |
| Switch Input (Model B) | Switch Dry Contacts Test Voltage: Maximum 2.5 V DC Test Current: Maximum 0.7 mA |
| Mains Specifications | Voltage: 115 V (90 to 127) / 230V (180 to 254) Frequency (non-US Deliveries): 50/60 Hz (47 to 63 Hz) Frequency (US Deliveries): 60 Hz (57 to 63 Hz) Power Consumption (maximum): 350 VA |
| Communication Interface | Serial Data Interface: USB 2.0 Device Port, USB 2.0 Host Port (3x) LAN: Ethernet MAC 10/100 Base-T |
| Miscellaneous | Operating Ambient Temperature: 32 to 104°F (0 to 40°C) Storage Temperature: -4 to 122°F (-20 to 50°C) Humidity: 0 to 90% RH Protection: IP-10 |
Click on a category to view a selection of compatible accessories with the AMETEK Jofra RTCt-157 Series Reference Temperature Calibrators.
| Funtional Specifications | |
| Temperature Range | At ambient temp. 32°F (0°C): -71 to 311°F (-57 to 155°C) At ambient temp. 73°F (23°C): -49 to 311°F (-45 to 155°C) At ambient temp. 104°F (40°C): -24 to 311°F (-31 to 155°C) |
| Accuracy with External STS Ref. Sensor (Models B and C) | RTCt-157 (model B and C): ±0.040°C/±0.072°F RTCt-156 (model B and C): ±0.065°C/±0.117°F |
| Accuracy with Internal Ref. Sensor (Models A, B, and C) | ±0.11°C/±0.2°F The RTCt Series follows rigorous metrological principles, ensuring that accuracy is reliable, repeatable, and fully traceable under documented conditions |
| Stability | ±0.005°C/±0.009°F Measured after the stability indicator has been on for 15 minutes. Measuring time is 30 minutes |
| Resolution | 1°, 0.1°, 0.01°, or 0.001° |
| Temperature Unit in Display | User Selectable: °C, °F, or K |
| Radial Homogeneity | 0.01°C/0.02°F at -32 °C/26 °F |
| Heating Time | -49 to 73°F (-45 to 23°C): 7 minutes 73 to 311°F (23 to 155°C): 17 minutes |
| Cooling Time | 311 to 212°F (155 to 100°C): 5 minutes 212 to 73°F (100 to 23°C): 10 minutes 73 to -22°F (23 to -30°C): 17 minutes -22 to -49°F (-30 to -45°C): 20 minutes 311 to -49°F (155 to -45°C): 52 minutes |
| Time to Stability | Approximately 10 minutes |
| Physical Specifications | |
| Dimensions | 14.3 x 6.7 x 14.3" (362 x 171 x 363 mm) |
| Weight | 22.7 lbs (10.3 kg) |
| Input Specifications | |
| RTD Reference Input (Models B and C) | Type: 4-wire RTD with true ohm measurement F.S. (Full Scale): 400 ohm Accuracy (12 months): ±(0.0012% rdg. + 0.0005% F.S.) Pt100(90)385 Reference: Temperature: -58°F (-50°C) / 12-Month Accuracy: ±0.026°F (±0.015°C) Temperature: 32°F (0°C) / 12-Month Accuracy: ±0.028°F (±0.016°C) Temperature: 311°F (155°C) / 12-Month Accuracy: ±0.035°F (±0.020°C) |
| DLC Sensor Input (Models B and C) | DLC-155: Temperature: -50°F (-58°C) / 12-Month Accuracy: ±0.024°F (±0.015°C) Temperature: 32°F (0°C) / 12-Month Accuracy: ±0.020°F (±0.012°C) Temperature: 311°F (155°C) / 12-Month Accuracy: ±0.016°F (±0.010°C) |
| RTD Sensor Under Test Input (Model B) | F.S. (range): 400 ohm Accuracy (12 months): ±(0.002% rdg. +0.001% F.S.) F.S. (range): 4000 ohm Accuracy (12 months): ±(0.003% rdg. + 0.003% F.S.) 2-wire: add 50 mOhm Pt100(90)385: Temperature: -50°F (-58°C)/12-Month Accuracy: ±0.026°F (±0.015°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.028°F (±0.016°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.035°F (±0.020°C) Pt500(90)385: Temperature: -50°F (-58°C)/12-Month Accuracy: ±0.120°F (±0.067°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.125°F (±0.070°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.139°F (±0.078°C) Pt1000(90)385: Temperature: -50°F (-58°C) / 12-Month Accuracy: ±0.066°F (±0.037°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.070°F (±0.039°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.081°F (±0.045°C) |
| Thermocouple Input | Range: -10 to 78 mV F.S. (Full Scale): 78 mV Accuracy (12 months): ±(0.005% Rdg. + 0.005% F.S.) Type E: Temperature: -58°F (-50°C)/12-Month Accuracy: ±0.14°F (±0.08°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.12°F (±0.07°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.12°F (±0.07°C) Type J: Temperature: -58°F (-50°C)/12-Month Accuracy: ±0.16°F (±0.09°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.14°F (±0.08°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.15°F (±0.08°C) Type K: Temperature: -58°F (-50°C)/12-Month Accuracy: ±0.21°F (±0.12°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.18°F (±0.10°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.19°F (±0.11°C) Type T: Temperature: -58°F (-50°C)/12-Month Accuracy: ±0.22°F (±0.12°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.19°F (±0.11°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.16°F (±0.09°C) Type R: Temperature: -58°F (-50°C)/12-Month Accuracy: ±1.91°F (±1.06°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±1.33°F (±0.74°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.86°F (±0.48°C) Type S: Temperature: -58°F (-50°C)/12-Month Accuracy: ±1.77°F (±0.98°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±1.31°F (±0.73°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.89°F (±0.50°C) Type N: Temperature: -58°F (-50°C)/12-Month Accuracy: ±0.30°F (±0.17°C) Temperature: 32°F (0°C)/12-Month Accuracy: ±0.28°F (±0.16°C) Temperature: 311°F (155°C)/12-Month Accuracy: ±0.24°F (±0.14°C) |
| Transmitter Supply | Output Voltage: 24 V DC ±10% Output Current: Maximum 28 mA |
| Transmitter Input mA (Model B) | Range: 0 to 24 mA Accuracy (12 months): ±(0.005% Rdg. +0.010% F.S.) |
| Voltage Input V DC (Model B) | Range: 0 to 12 V DC Accuracy (12 months): ±(0.005% Rdg. + 0.010% F.S.) |
| Switch Input (Model B) | Switch Dry Contacts Test Voltage: Maximum 2.5 V DC Test Current: Maximum 0.7 mA |
| Mains Specifications | Voltage: 115 V (90 to 127) / 230V (180 to 254) Frequency (non-US Deliveries): 50/60 Hz (47 to 63 Hz) Frequency (US Deliveries): 60 Hz (57 to 63 Hz) Power Consumption (maximum): 350 VA |
| Communication Interface | Serial Data Interface: USB 2.0 Device Port, USB 2.0 Host Port (3x) LAN: Ethernet MAC 10/100 Base-T |
| Miscellaneous | Operating Ambient Temperature: 32 to 104°F (0 to 40°C) Storage Temperature: -4 to 122°F (-20 to 50°C) Humidity: 0 to 90% RH Protection: IP-10 |
Click on a category to view a selection of compatible accessories with the AMETEK Jofra RTCt-157 Series Reference Temperature Calibrators.
