LINK ECU - 4 x Exhaust Gas Temperature Probe Bundle (EGTs)Extreme Duty Fast Response EGT Temperature Probe. This bundle includes four EGTs. Type K thermocouple probe Exposed sensing junction for fastest response Includes 316 SS adjustable compression fitting Stainless steel protected wires Designed for extreme engine test & racing environments Thermocouple type: K Range: 148 to 2372F ( 100 to 1300C) Accuracy: + 0. 4% of reading or about + 1. 1C (Special Limits of Error) Probe diameter: 1 4 inch (0. 250 inch)