The Amprobe IR608A and Extech 42540 are popular and effective heat sensor devices, according to Good Housekeepiing. These hand-held devices, also called thermal leak detectors, use laser beams to provide accurate results.
The Amprobe IR608A is a pistol-grip thermal leak detector with a large display screen and trigger activation. This lightweight device offers a wide temperature detection range and displays results in Fahrenheit and Celsius.
The Extech 42540 also has a pistol-grip design and bright, backlit digital display. It provides accurate results on a wide range of materials, and detects temperatures up to 1400 degrees Fahrenheit. It also has an automatic shutoff function. The Extech 42540 comes with a battery and storage case.