Engine ThermometerLiquid-FilledBlack Face1.400 in. OD10-Degree Fahrenheit Increments0-250 Degree Fahrenheit RangeThreads: 3/8 in. Male NPTProbe Length: 1 in. The JEGS 41424 engine thermometer provides a quick temperature reference when working in the engine bay. Rather than relying on your coolant temperature, this gauge lets you get precise readings based on where it's located. Some potential locations include cylinder heads, intake manifolds, and transmissions.FeaturesLiquid filled to absorb vibrations, stabilize needle, and prevent damage to the gaugeTighten with a 17mm wrenchDimensions: 2.370 in. L x 1.400 in. D (gauge face)Probe dimensions: 1 in. L x 1/4 in. DThread dimensions: 3/8 in. NPT x 0.572 in. L