HT609 Gas Leak Detector Sound Screen Alarm with LCD Display Gas Detector Combustible Flammable Natural Methane Gas Detector   【Large Backlight LCD with Temperature Humidity 】: Gas tester integrated temperature humidity sensor greatly expands the testing applications. Temp support ℉/℃ switch, meet more demand in work. LCD display greatly enhance the reading experience, the large monitor with backlight make it very easy to read, even in bright sunlight or poor light. Friendly to the hearing impaired and the elderly. 【Sound Light Alarm】: Hold this gas leak detector for home in the area where you think there might be a leak, 2s fast respon. When detecting flammable gas leak, LCD analog bar change and turn to red, detecter continuous beeping sounds. Easy to judge leakage levels. Mute mode is available. Press Audio Alarm button to turn it ON/OFF. 【Three Sensitive Modes】: Features 3 sensitive modes of high(SENS-H),middle(SENS-M) and low(SENS-L).When you have already smelled a strong smell, the low sensitivity mode helps you to double confirm the leakage. But if you are not sure whether there is leakage and smell nothing, the high sensitivity mode will greatly improve the accuracy of test result and protect you and your family.