The SPARTNA SPR-746 is a compact, explosion-proof ozone (O₃) 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 serious health and safety risks. It features a high-accuracy electrochemical sensor with a measurement range of 0–20 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: 5 ppm, High: 10 ppm). Supplied with a rechargeable 3.7V Li-ion battery (≥8 hrs runtime), calibration cap, USB communication cable, charger, and rugged carrying case.