Portable infrared gas detector for combustible, toxic and freon gases, with an interference-gas filtering algorithm. A built-in diaphragm pump provides adjustable flow from 100–1,000 ml/min (normally 500 ml/min). The rechargeable lithium-ion battery supports up to 15 hours of operation at 500 ml/min, with USB Type-C charging. A 2.0-inch colour TFT LCD displays the gas value and flow rate. Two-stage alarms and trouble indication include a 90 dB audible alarm at 1 m. Accuracy: ±3% of full scale. Dimensions: 70(W) × 170(H) × 170(D) mm; weight: 1.9 kg.