Combustible Gas Detector Detects Methane Propane Butane and More Measuring Range 50 ppm to 100 Percent Volume Methane Propane Accuracy +/-10 Percent Audible Direct Read Display Visual Indicator Features 16 in Probe Direct Reading up to 100 Percent v/v Instantaneous Response UL Classifieds Only as to Intrinsic Safety in Class 1 Div 1 Groups C and D Battery (3) C Alkaline Height 11 1/2 in Width 3 in Depth 2 5/16 in