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The Extech MO50A is a compact, easy-to-use pin-type moisture meter designed to measure the moisture content inside materials like wood, drywall, concrete, and plaster. It’s widely used in construction, restoration, and inspection work to detect moisture problems such as leaks, dampness, or water damage.
The Extech MO50A is a compact, easy-to-use pin-type moisture meter designed to measure the moisture content inside materials like wood, drywall, concrete, and plaster. It’s widely used in construction, restoration, and inspection work to detect moisture problems such as leaks, dampness, or water damage.
The MO50A operates using two metal pins that penetrate the material to transmit a small electrical signal. Because moisture affects electrical resistance—where higher moisture results in lower resistance and lower moisture results in higher resistance—the device measures this change and converts it into a moisture percentage reading. This pin-type method allows the meter to deliver highly accurate measurements of internal moisture content, rather than just surface-level readings making it a must-have tool for analyzing the after-effects of water leakage behind walls and in ceilings.
Features
Applications
| Display | Backlit Color LCD |
| Sensor Type | Replaceable threaded contact pins, 0.3" (8 mm) |
| Electrode Pin Length | 0.3" (8 mm) |
| Electrode Pins | Integrated, Replaceable, 0.3" (8 mm) |
| Measurement Principle | Electrical resistance using pins |
| Measurement Indication | Digital, Moisture Droplet icons and Beeper for High, Medium, Low indication |
| WME Moisture Content (Pin) | Wood Range: 5.0% to 50.0% Building Material Range: 1.5% to 33.0% |
| Measurement Range (Wood) | Low: 1.5% to 16.9% Medium: 12% to 15.9% High: 16% to 50% |
| Measurement Range (Building Material) | Low: 1.5% to 16.9% Medium: 17% to 19.9% High: 20% to 33% |
| WME Moisture Content Max Resolution (Pin) | 0.1% |
| WME Moisture Content Basic Accuracy (Pin) | ±(3% + 5 digits) at 72 to 77°F (22 to 25°C) |
| Auto Power Off | After approx. 3 minutes. |
| Battery Type | 3 x 1.5 V, AAA batteries |
| Power Consumption | < 45 mA, APO < 10 µA |
| Battery Status Indicator | 3-bar battery icon (100% to empty) Full above 4.5 V Two Lattice 4.2 V to 4.5 V One Lattice 3.9 V to 4.2 V Empty Frame 3.3 V to 3.6 V Shutdown below 3.3 V |
| Operating Conditions | 41 to 113°F (5 to 45°C); < 80% RH |
| Storage Conditions | 32 to 122°F (0 to 50°C); < 85% RH |
| Operating Altitude | 6562' (2000 m) |
| Dimensions | 6.7 x 2.7 x 1.3" (171.6 x 68 x 32.5 mm) |
| Weight | 151 g (0.33 lb) excluding batteries |
| Certifications | CE, UKCA |
| Shock | 4 feet drop per EN 61010-1 |
| Vibration | Random Vibration per MIL-PRF-28800F Class 2 |
| Electromagnetic Compatibility Standards (EMC) | EN61326-1 |
| Accessories Included | Protective cap, 3 × AAA batteries, 2 x replacement pins, quick start guide |
| Warranty | 2 years |
| Display | Backlit Color LCD |
| Sensor Type | Replaceable threaded contact pins, 0.3" (8 mm) |
| Electrode Pin Length | 0.3" (8 mm) |
| Electrode Pins | Integrated, Replaceable, 0.3" (8 mm) |
| Measurement Principle | Electrical resistance using pins |
| Measurement Indication | Digital, Moisture Droplet icons and Beeper for High, Medium, Low indication |
| WME Moisture Content (Pin) | Wood Range: 5.0% to 50.0% Building Material Range: 1.5% to 33.0% |
| Measurement Range (Wood) | Low: 1.5% to 16.9% Medium: 12% to 15.9% High: 16% to 50% |
| Measurement Range (Building Material) | Low: 1.5% to 16.9% Medium: 17% to 19.9% High: 20% to 33% |
| WME Moisture Content Max Resolution (Pin) | 0.1% |
| WME Moisture Content Basic Accuracy (Pin) | ±(3% + 5 digits) at 72 to 77°F (22 to 25°C) |
| Auto Power Off | After approx. 3 minutes. |
| Battery Type | 3 x 1.5 V, AAA batteries |
| Power Consumption | < 45 mA, APO < 10 µA |
| Battery Status Indicator | 3-bar battery icon (100% to empty) Full above 4.5 V Two Lattice 4.2 V to 4.5 V One Lattice 3.9 V to 4.2 V Empty Frame 3.3 V to 3.6 V Shutdown below 3.3 V |
| Operating Conditions | 41 to 113°F (5 to 45°C); < 80% RH |
| Storage Conditions | 32 to 122°F (0 to 50°C); < 85% RH |
| Operating Altitude | 6562' (2000 m) |
| Dimensions | 6.7 x 2.7 x 1.3" (171.6 x 68 x 32.5 mm) |
| Weight | 151 g (0.33 lb) excluding batteries |
| Certifications | CE, UKCA |
| Shock | 4 feet drop per EN 61010-1 |
| Vibration | Random Vibration per MIL-PRF-28800F Class 2 |
| Electromagnetic Compatibility Standards (EMC) | EN61326-1 |
| Accessories Included | Protective cap, 3 × AAA batteries, 2 x replacement pins, quick start guide |
| Warranty | 2 years |
