Bird 43 4391 Thruline Watt Meter PEP-Dual Element, Power Analyst VERy CLEAN
They need no attenuators, directional couplers or charts. These 4391 are a little scratched, so you save. Shock-resistant keyboard and range switches. RFI protection. Frequency: 0.45 - 2700 MHz. Power: 100 Mw – 10 kW.