The Agilent HP 431C Power Meter provides power ranges of 10 µW to 10 mW fs in 7 ranges; calibrated in dBm from -20 dBm to +10 dBm fs in 5 dB steps. FEATURES:

• Accuracy of ±1% of full scale on the 100 µW range and above
• DVM output of 1.000 V (600 ohms load impedance) for full scale indication
• Calibration Factor Control to account for thermistor calibration factor
• External temperature-compensated thermistor mounts are required for operation (478A or 486A series, sold separately)