This is the Engine Temperature Gauge with Stopwatch from O'Donnell Racing. Measures engine temperature in Fahrenheit (F) or Celsius (C) to help reduce damage from overheating Push button start and push button control for setup and measurement Mirrored "O" cone for point accuracy Probe cone helps shield against outside interference insuring more accurate readings 15 second data hold function Stopwatch function is ideal for taking lap times (.01 of a second) Yellow backlit LCD screen allows easy reading at night or indoors Auto-off feature turns unit off after 15 seconds to conserve battery power, battery level indicator Powered by a long lasting non-rechargeable lithium battery Adjustable emissivity Carrying pouch with loop for slipping through a belt Temperature Gauge and Stopwatch, battery, carrying pouch Temperature Range: -27° to +428°F (-33 to +220°C) Ambient Temperature Operating Range: +14° to +122°F (-10 to +50°C) Adjustable Emissivity: 0.05 to 1.00 (1.00 default) Display Resolution: 0.1°F or C Response Time: 1 second Field of View: 1:1 optics ratio Battery Life: 960 (15 sec) readings or 1 hour continuous Battery Type: CR2032 Lithium Weight: 1.5oz (44g) 3.4 x 1.9 x 0.9" (85 x 48 x 23mm) This temperature gauge accurately measures R/C engine temperatures, but modeler should always refer to engine instruction manual for proper tuning and set-up. Temperature alone is not a complete indicator of proper engine performance. jxs 9/22/06 ir/jxs &