TopTes PT520A+ is an efficient, handy combustible gas detector. Compared with other handheld gas detectors, its 17inch long probe is the main feature. With TopTes PT520A+ gas detector, you can accurately find out the gas leaks from various combustible gases in tight spaces, such as methane, natural gas, propane, liquefied petroleum gas(LPG), gasoline, etc. Moreover, it provides 75 dB audible and three-color visual alarms in the presence of methane at concentrations as low as 50 ppm.TopTes PT520A+ gas leak detector updates rechargeable battery. With that, you could recharge for more than 3000 times.Note: Please allow 30 seconds of warm-up time before the operation. Otherwise, it wont work properly.Power SavingDetector will automatically shutdown after 10 minutes without operation or gas detection. *Disable the Auto Power-Off by press the APO button.Low Battery IndicatorThe low battery indicator will appear on the screen when the battery voltage is below 3.6V. It can still be used several times after the icon first appears.Mute the AlarmYou can simply turn off the alarm beeps with the mute button.SpecificationSensor: Gas Sensitive Semiconductor (GSS)Warm-up Time: 30 secondsResponse Time: = 500ppm: 0.5 - 3 seconds; >500ppm 0.5 - 2 secondsDetection range: 50 to 10,000 ppm* (*based on Methane).Alarm: Visual: 7 bar graph; Audible: Variable Tone Frequency BuzzerPower Source: 1S1P 800mAH rechargeable Lithium polymer batteryOperating Conditions: 0 - 50C, 20 - 80%RHDimensions: 23.03'' x 2.17'' x 1.10'' Weight: 8.69 oz. Material: ABSCertification: CE, UKCA, RoHS, FCCWhat You Get1x PT520A+ Gas Leak Detector1x Protective Case1x User Manual