Effective Gas Leak Detector The TOPTES PT520A natural gas detector detects leaks of methane, propane, natural gas, LPG, butane, and more in tight spaces. Flexible Probe The 17inch gooseneck allows easy access to hardtoreach areas like pipelines, storage tanks, gas fireplaces, and basements, ideal for both indoor and outdoor leak detection Visual and Audible Alarm PT520A responds in 0.5 seconds, with 7 colored bars and a 75dB alarm that increase with gas concentration. Detection range 5010,000 ppm Methane. Detection distance 15cm UserFriendly Functions Enable or disable Auto PowerOff with the APO button to save power after 10 minutes of inactivity. The Mute button silences the alarm, and the nonslip, wearresistant design ensures a secure, comfortable grip for easy handling What You Get 1PT520A Gas Leak Detector, 3AAA Batteries, 1Protective Case, and 1User Manual. Allow 30 seconds for warmup before use