Accuracy: Larger ±3% or ±0.3mL/min (calibration gas N2) Operating temperature range: 10-40℃ (accuracy guarantee range is 15-30℃) Tube: Inner diameter 3mm, outer diameter 7mm (heat resistant temperature up to 200℃) Battery: 2 AA alkaline batteries Specifications: WEEE, RoHS, CE Subject gas: N2, Air, He, Ar, H2, etc. Measurement range: 0.5-1200mL/min (display range is -0.1-1400mL/min) Depth (mm): 135 Height (mm): 35 Width (mm): 76