With compact design and color LCD, Model Recon/4 is capable of simultaneously monitoring for CO (0–1,000 ppm), H2S (0–100 ppm), O2 (0–30% by volume), and combustible gas (0–100% LEL Methane). Instrument has STEL, TWA, and 2 instant alarms with audio/visual and vibratory indicators; rechargeable battery; and one-button operation. Belt-clip-style detector, designed to be intrinsically safe, also offers adjustable alarms and calibration points.