The TP-9360 Pro-Alert from Tracer Products is a portable refrigerant leak detector that features heated-diode sensor technology to detect refrigerant leaks down to 0.03 oz/per year. The Pro-Alert features dual-sensitivity controls—a high-sensitivity setting when initially checking the general leak area and a low-sensitivity setting to zero in on the exact leak site. The compact, cordless device is self-calibrating to neutralize background contamination and is sensitive to both R-12 and R-134a refrigerants. Pro-Alert is 17 in (432 mm) long and chrome-plated with a flexible metal probe that reaches tight spots and holds its position for thorough inspection. A built-in positive displacement pump draws a test sample into the detector for sensing, and a rugged plastic carrying case is included.