Monitors exhaust gas temperature (EGT). Protects durability by eliminating safe-EGT-level guesswork. Eliminates erroneous readings with ambient temperature compensation. Accurate within 15 degree F at maximum operating temperatures. 2000 degree F-rated, chromel-alumel thermocouple wire provides superior conductivity. Illuminated 0-1500?F full-sweep face. Comes with probe & 10' lead wire. Includes weld bung.