Specifications:Introduction:This product is used in the measurement of up to 8 cylinders (rotation speed RPM) of 2-stroke or 4-stroke fuel or gasoline engines, engine working timing accumulation time, and some other unique functional designs.Energy saving and power saving are convenient and practical: when the gasoline engine is not working, the tachometer will automatically save energy and power, and automatically turn off the display; when the gasoline engine is working, the tachometer will automatically start the test.Model: GCJ-01Type: Digital TachometerMeasuring range: 100-20000Measurement accuracy: 1%Resolution: 100%Power supply: button batteryPacking: boxesNotes:please allow 1-3cm error of measurement.Photo color might be a little different from the actual product due to color display of different monitors. Package included:1 x Tachometer"