Geiger PLUS Carbon Monoxide Monitor ACSS and the letter F appears

and the letter F appears to indicate this mode

Standing Wave Ratio: 1

including attitude

Volume control is controlled through a low-profile knob with detent settings to prevent accidental changes

Geiger PLUS Carbon Monoxide Monitor ACSS and the letter F appearsGEIGER PLUS Personal Carbon Monoxide Monitor Geiger PLUS is a key fob sized unit that provides real time aural alarm when carbon monoxide levels are dangerously high. The unit provides a very loud distinctive alarm at ~41 PPM and an even more annoying alarm at 100 PPM. The product also detects Volatile Organic Compounds, such as gasoline. In contrast to competitive products, GEIGER PLUS is much smaller, more responsive and rechargeable. It is designed