Sampling flow range: 5m Operation mode: handheld Measurement object: Tetrahydrophene Measurement accuracy: 99% Test range: 0-1ppm, 10ppm, 100ppm Response time: â?¤ 30 seconds Working voltage: 3V lithium battery Detection accuracy: â?¤�± 3% F.S Dimensions (length x width x height): 14.7 * 12.9 * 3.1 (cm) Features: No need to replace battery, waterproof, dustproof and explosion-proof Brand: Drager