The 42BD RF Microwattmeter is a digital unit with 3 1/2 digit resolution. Power range of 10 nW to 10 mW full scale in 6 ranges. Uncertainty on all ranges is (one digit + 0.8 dB). Cover the frequency range of 200kHz to 18GHz. Also provides a BCD & proportional DC output for connection to external system. Requires 41-4 series power sensors (sold separately).