The SPARTNA SPR-743 is a compact, explosion-proof formaldehyde (CH₂O) gas detector designed for use in hazardous industrial environments—including petroleum, chemical, metallurgy, refining, agriculture, and environmental monitoring—where worker safety and equipment protection are critical. It features a high-accuracy electrochemical sensor with a measurement range of 1–50 ppm, IP67 waterproof/dustproof rating, and Ex ib IIB T3 Gb explosion-proof certification. Real-time readings are displayed on an LCD, while multi-mode alarms (audible, visual LED, and vibration) activate at user-set thresholds (Low: 2 ppm, High: 5 ppm). Supplied with a rechargeable 3.7V Li-ion battery (≥8 hrs runtime), calibration cap, USB communication cable, charger, and carrying case.