Combustible Gas Detector, Calibration Certificate Type Not Certified, Features Pinpoint Gas Leaks for Closed Piping Systems, The Meter Emits a Frequency Tone when Gas is Detected, Gases Detected Methane, Propane, Includes GSD600, Soft Carrying Case, Maximum Operating Temperature 113 Degrees F, Minimum Operating Temperature 23 Degrees F, PPM Accuracy Not Applicable, PPM Detection Range 35 to 580 ppm (Propane), 40 to 640 ppm (Methane), Probe Length 17.6 in, Overall Height 7 in