Enmet's Recon/4 compact, portable gas detector has a color LCD display, adjustable alarms and adjustable calibration points. It can monitor for CO, H2S, O2 and combustible gas simultaneously. The RECON/4 features two instant alarms with audio, visual and vibratory indicators. Offering STEL and TWA alarms for CO and H2S, the unit also has a rechargeable battery and a one-button operation. This small, belt-clip-style instrument weighs about 200 grams and offers an anti-slip rubber casing.