This little gadget is really handy, I have mine connected between the radio and the ATU a glance you can see if the ATU is doing it's job.
GH-S180 120W SWR/Power Meter has:
- High Standing Wave Alarm Function
- 240 * 240 Full Color HD Display
- 120w Power rating
- Forward and reverse power
- Operating frequency: 1.8-54Mhz
- Measuring range: 0.5-120W
- Battery model: 3.7v/1000mAh (when the battery voltage is lower than 3.4v, the buzzer will ring for charging, and it will automatically shut down when the battery voltage is lower than 3.35v)
- SO239's on the back
- Size: 88mm * 63mm * 38mm (excluding protruding parts)