The H-10 PRO from Bacharach USA is a highly responsive universal refrigerant leak detector that uses heated diode sensor technology. It is ultrasensitive to all halogen-based, nonflammable CFC, HFC and HCFC refrigerants for reliable use in a wide range of refrigerant leak detection applications. It can detect refrigerants as low as 0.006 ounces per year, including R-410A and R-507, and comes equipped with dual power options for either battery operation for wall power for uninterrupted usage. Visual and audible indicators include an incremental flashing LED in the probe tip, an internal speaker and a headphone jack. It has a 4.5-foot probe for detecting leaks in hard-to-reach areas, visual and audible indicators to show relative leak sizes and an auto-zeroing feature (automatic mode only) for finding leaks in backgrounds where target gas is present. It has an internal sensor calibration reference to ensure optimum performance. 800-736-4666; www.mybacharach.com.