THE NGD269 IS IDEAL FOR CHECKING AUTOMOTIVE EXHAUST AND FUEL SYSTEMS LIQUID- AND GAS-FIRED HEATING SYSTEMS PROPANE TANKS AND FILLING STATIONS CRACKED HEAT EXCHANGERS AND MANHOLES/SEWERS. UL STYLE""MARGIN-TOP0PX; PADDING-TOP 5PX; PADDING-BOTTOM 5PX;"" DETECTS THE PRESENCE OF MOST COMBUSTIBLE GASES WITHOUT MEASURING OR DISPLAYING THEIR CONCENTRATION. THE UNIT'S ANALOG BAR GRAPH AND THE SPEED AND TONE OF ITS AUDIBLE ALARM ENABLE THE NGD269 TO PINPOINT THE LOCATION OF A GAS LEAK BY COMPARING ITS RESPONSES TO GAS EXPOSURE AT DIFFERENT POINTS. MEASURES AND DISPLAYS THE CONCENTRATION OF CH4 (METHANE/NATURAL GAS) C3H8 (PROPANE) AND H2 (HYDROGEN) FOR REFERENCE PURPOSES. READINGS ARE DISPLAYED IN DIGITAL FORM IN PPM LEL (LOWER EXPLOSIVE LIMIT) OR VOL (PERCENTAGE BY VOLUME). THE DIGITAL READINGS PROVIDE A THIRD BASIS FOR COMPARING GAS LEVELS AT DIFFERENT LOCATIONS. HIGH-SENSITIVITY DURABLE SEMICONDUCTOR GAS SENSOR AUTOMATICALLY SELF-TESTS ALL CIRCUITRY (INCLUDING THE GAS SENSOR) UPON STARTUP MEASUREMENTS OF CH4 C3H8 AND H2 ARE CALIBRATABLE AT MULTIPLE POINTS OVER SPECIFIC RANGES USING A SIMPLE SEQUENCE OF INTERACTIONS WITH ON-SCREEN INTERFACES 13 IN. (330MM) LONG FLEXIBLE GOOSENECK PROBE FAST WARMUP AND RESPONSE TIMES ONE BUTTON PRESS MAKES THE AMBIENT ENVIRONMENT THE MEASUREMENT BASELINE HEADPHONE JACK ON-SCREEN BATTERY STATUS INDICATION POWERED BY A RECHARGEABLE 3.6V NI-MH (NICKELMETAL HYDRIDE) BATTERY COMES IN A HARD PLASTIC CARRYING CASE ALONG WITH A 110VAC BATTERY CHARGER 1-YEAR LIMITED WARRANTY