... 100~40,000RPM Rotation Speed Resolution: 1RPM GASOLINE ENGINE TACHOMETERSM8237Inductive type measure the engine speed by noncontactMeasuring the temperature cooling water in ... rotate speed Testing the rotate speed used to 2 stokes and 4 strokesCan set the cylinder in ... 2, 3, 4, 5, 6, 8, 12 or set ... : 0~200°CTemperature Resolution: 0.5°CTemperature Accuracy: ±2°C