The ET120 is it the perfect choice for HVAC professionals. It is an easy-to-use tester that provides audible and visual alarms in the presence of methane, propane and other combustible gases at concentrations as low as 50 ppm. It features two levels of sensitivity depending on users' needs: High (approximately 50 to 1000 ppm) and Low (approximately 1,000 to 10,000 ppm).Features Automatic zero-point calibration at power-up (lights will flash during self-calibration; this does not indicate the presence of gas) Five red LED's (visual) and 85dB audible alerts that increase with gas concentration 18-Inch flexible gooseneck expands sensor's reach; clips onto meter for storage Auto power-off after 10 minutes of non-usage conserves battery life Over-molded body for comfortable grip Detection range: Approximately 50 to 10,000 ppm* (*based on Methane) Two levels of sensitivity: High (approximately 50 to 1000 ppm) and Low (approximately 1000 to 10,000 ppm) Audible Alert, Auto-Power Off, Visual Notification Includes detector, 4xAAA batteries, instruction manual and storage pouch Warnings Gas Detector is NOT intended for use as personal protective equipment (PPE) Read, understand and follow all instructions to ensure safe operation Always turn on the gas detector in an area known to be free of combustible gases Detection Range: 50 to 10,000 ppm Sensitivity Levels: High (50 to 1,000 ppm), Low (1,000 to 10,000 ppm) Audible Alert: 85 dB Visual Alert: 5 Red LEDs Sensor Type: Electrochemical Sensor Life: Up to 7 years Calibration: Automatic zero-point at power-up Auto Power Off: After 10 minutes of inactivity Overall Length: 28.3 in (71.9 cm) Width: 1.79 in (4.5 cm) Overall Height: 2.75 in (7 cm) Weight: 0.837 lb (380 g) Battery Type: 4 x AAA Material: Over-molded body for grip Display: Digital Compliance: CE Certified DownloadsSpec SheetSafety Data SheetVideo DownloadInstructionsET120-Manual - WEB.pdf