Combustible Gas Detector, Calibration Certificate Type Available Separately, Features Auto Zeros, Fits in Shirt Pocket, Low Power Semiconductor Sensor, Responds Instantly, Sensitive to 1000 ppm (Methane), Gases Detected Butane, Diesel, Gasoline, Kerosene, Methane, Propane, Includes Sensor (Installed and Calibrated), Maximum Operating Temperature 104 Degrees F, Minimum Operating Temperature 32 Degrees F, PPM Detection Range 40 to 5,000 ppm, Probe Length 1 in, Battery Voltage 1.5V