NISSEI RS-502 SWR & Power Meter SWR Watt Meter 1.8-525MHz HF VHF UHF For Radio

  
Minimum Power for SWR: 3W. Testing Function: FWD/REF POWER, REP, SWR. The low insertion loss (0.3dB or lower) structure allows it to be permanently connected. 5W Accuracy Range: (AVG) +/- 10%, (REP) +/- 15%.