The SPARTNA SPR-745 is a compact, explosion-proof ethylene oxide (ETO) gas detector designed for use in hazardous industrial environments—including petroleum, chemical, metallurgy, refining, pharmaceutical manufacturing, agriculture, and environmental protection—where toxic gas leaks pose safety risks. It features a high-accuracy electrochemical sensor with a measurement range of 0–100 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: 10 ppm, High: 20 ppm). Supplied with a rechargeable 3.7V Li-ion battery (≥8 hrs runtime), calibration cap, USB communication cable, charger, and rugged carrying case.