The Proton water temperature meter will provide you with a precise reading of your engines coolant temperature. Supplied with a 1/8 BSP sensor, this meter will provide you with accurate temperature readings and help avoid overheating.FEATURES Temperature Range: 32 ~ 248 °F (0 ~ 120 °C) Temperature warning Range: 60~250 °C (140~482 °F) Max temperature Record: 32 ~ 248 °F (0 ~ 120 °C) Internal battery type: CR 2032 Battery lifetime (continuously) ± 350 H Battery self consumed lifetime: ± 5 years Effective temperature range: 14 ~ 140 °F ( 10 ~ 60 °C) Meter standard: JIS D 0203 S2 Meter size: (L x W x H) 11/16 x 1-15/16 x 1-5/16" (18 x 49 x 33 mm) Note: Unit comes with sensor. Temperature adaptor required.