This Tachometer, With Mini Size, High Performance And Fast Reaction Speed, Is Greatly Suitable For Detecting The Speed Of All Kinds Of Engines. It Can Accurately Test The Rpm Value For Engines.Features:Mini Size, High Performance And Fast Reaction Speed.0.56" 4 Led Display Digits, Clear And Easy For ReadingsRotation Speed Measurement Range: 5-9999Rpm; Frequency Range: .. 0-98990.1HzParameter Setting Will Be Remembered When Power OffSuitable For Detecting The. Speed Of All Types Of EnginesRate Tachometer Tuning Instructions:1. Rate Range: 1-99 (Default 01: Display Value Is The Same With The Actual Value, If The Rate Is 10, The Display Value * 10 = Actual Value);2. When Power On, Counter Display "0";3. Press "Set", Display "1", Press Again, Display "01"...4. When Display "1", Is Rpm Measurement; Press "Add", From "1" To "2", When The Display "2", Is The Frequency Measurement; Display "01" Is For Rate Adjustment, Short Press "Add" For +1 , Long Press For +10;5. After Setting The Values, It Will Be Stored If No Operation In 10S, Return To The Selected Function Interface;6. With 1 Decimal Point, Which Is When The Rotation Speed Is \U0026& 1000Rpm.Tips:User Can Set The Appropriate Rate To Measure Frequency, Below 100Khz (999.9*99=98990.1Hz).Features:Display: 0.56" 4 Digit LedDisplay Color: Blue/Green/Red(Optional)Rotation Range Speed: Range 5-9999RpmFrequency: 0-98990.1HzRate Setting Range: 1-99 (Default: 01)Reset Lasts: 10SRefresh Time: 120-1200Rpm: 0.2~0.5S; 2400-9999Rpm: 0.25~0.6SAccuracy: \U0026& 5000Rpm:. About 3RpmSignal Input: Voltage Pulse Signal, Active Contact Signal, Pnp, NpnPower Supply: Dc 8-15VInstallation: Onboard* Wiring:+ 12V: Dc 8-15V Between PositiveGdn: Dc Power NegativeIn+: Signal InputPanel Dimension: 72 * 36 * 20Mm / 2.83 * 1.42 * 0.8InItem Weight: 25G / 0.88OzNote:The Sensor Is Not Included, This Tachometer Can'T Be Used To Test The Car Turn Gear Separately List Of Packages:.