Monitors exhaust gas temperature (EGT) in diesels. Protects durability by eliminating safe EGT level guesswork. Eliminates erroneous readings with ambient temperature compensation. Accurate within 15 deg. F at maximum operating temperatures. 2000 deg F chromel-alumel thermocouple wire provides superior conductivity. Illuminated 0-1500 deg. F full sweep face. 1 year limited warranty.