Recon/4 is a new compact portable gas detector with a colour LCD from Enmet Corporation (USA). It can monitor for CO, H2S, O2 and combustible gas simultaneously. The instrument features STEL, TWA and two instant alarms with audio/visual and vibratory indicators, rechargeable battery, and one-button operation for simple use. This small belt-clip-style instrument weighs about 200 grams. Recon/4 is designed to be intrinsically safe.