This is the Engine Temperature Gauge with Stopwatch from O'Donnell Racing.

FEATURES: 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

INCLUDES: Temperature Gauge and Stopwatch, battery, carrying pouch

SPECS: 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)
Dimensions: 3.4 x 1.9 x 0.9" (85 x 48 x 23mm)