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Long life, stable sensorAutomatic calibration and reset to ambient levels3 adjustable sensitivity levelsCertified SAE J2791, EN14624, and CE2 year warranty includes sensor The model D400 leak detector features a long life heated sensor technology that is designed to detect the more current and difficult HFC refrigerants such as R-134a in addition to all HCFC and CFC refrigerants including SNAP approved hydrocarbon blends. The D400 instrument uses standard AA alkaline batteries. The unique "finger guard" case design also makes the detector drop-proof and allows for conveniently hanging the detector on the shop wall for storage. Other features include: true mechanical pump and low battery indicator. Uses 4 AA alkaline batteries. Made in the U.S.A. Most Gauges & Specialty Tools products are available for in-store pickup from Advance Auto Parts.

Long life, stable sensorUnique numeric leak size indicatorVisual LED leak alarm located near sensorCertified SAE J2791, EN14624 and CE2 year warranty includes sensor Techno Tools? D440A features a long life heated sensor technology that is designed to detect the more current and difficult HFC refrigerants such as R-134a in addition to all HCFC and CFC refrigerants including hydrocarbon "blends". The D440A? s unique digital leak size indicator takes the guesswork out of whether or not to repair a small leak. The digital display is independent from the audio alarm and sensitivity level, allowing the precise pinpointing of the leak source. Automatic calibration and reset to ambient levels. Other features include: true mechanical pump, low battery indicator, audio mute function and comfortable neoprene grip. The D440A uses standard AA alkaline batteries. Most Gauges & Specialty Tools products are available for in-store pickup from Advance Auto Parts.