Combustible Gas Leak Detector with DIGITAL READOUT. Measures in PPM, % LEL, or % vol. 7899 E-Instruments Gas Sniffer QUANTIFIES combustible gas leaks with large, easy-view LCD & 11-inch flex sensor. IN THE BOX: 7899 Portable Combustible Gas Sniffer with 11 inch Gooseneck Probe, 6 AAA Alkaline Batteries, Soft Vinyl Carrying Case, User Manual QUANTITATIVE LEAK DETECTOR. Actual PPM, % LEL, or % vol readouts on the large, easy-to-read LED for Natural Gas, Propane, Town Gas, Methane, Butane, Kerosene, Gasoline and more. Applications for HVAC, residential, commercial, engines, piping, and industrial processes. LIGHT-WEIGHT AND CONVENIENT: Small, lightweight portable gas detector nicely fits in your hand and toolbox for easy transport and use. The 11 inch flexible probe helps detect small combustible gas leaks in hard-to-reach places and around appliances. RUGGED AND ACCURATE: Built tough to handle daily field use. Accurate, sensitive readings help you identify and pinpoint leaks. Semiconductor sensors improve sensitivity and extend service life. Auto ZeroDrift Adjustment on power-up. DESIGNED WITH THE HVAC TECH IN MIND. Audible beep interval adjusts as gas levels rise and fall, helping techs zero in quickly on leaks. Large easy-view LED gives numeric and virtual analog scale readings for accurate reporting. Short warm-up time and audible beep to signal instrument ready. Press-and-hold On/Off button prevents accidental shut-off. Selectable auto shut-off time. Hold key. Battery and sensor status indicators.