Bird Model 4371 Digital Broadband Thruline Wattmeter 1 Watt to 1000W, 25-520 MHz Power Scales 10, 100, 1000 Watts Forward and 1, 10, 100 Watts Reflected Power Broadband Thruline Remote Power Sensor tethered on a 5' cable. Copy of the original Bird manual is included. 110 VAC Power, Power Sensor stored in rear when not in use. Accuracy +/- 5% full scale, calibration is not guaranteed. Used in very good condition, checks OK on all scales. Tested in specification at 150 MHz and 450 MHz. Bird QC Connectors on the broadband power sensor. Specify Type N, UHF or BNC connectors. Type N(F) connectors are standard.