Hewitt Industries 2" Pyrometer, 100° Sweep, 700°F/1700°F (010-114-1R-1) A pyrometer measures and displays extremely high temperatures, such as those found in your engine's manifold pre-turbo or near the exhaust pipe flange. This 2" diameter pyrometer features a 100ø dial sweep and will indicate a temperature range of 700øF to 1700øF.