Feature:1. Accurate and Stable: The motor tachometer has good stability, high measurement accuracy and strong anti interference ability.2. Memory Storage Function: The RPM speed meter has memory function, the set parameters will not be lost after power off.3. Multi Function: Equipped with sound and light integrated alarm, can monitor the motor speed in real time according to the set parameters.4. Easy Installation: The meter adopts standard size, easy to install, with reverse polarity protection, power supply voltage range DC 730V.5. ABS and Stainless Steel Material: Made of ABS and stainless steel material, has high strength, good rust and corrosion proof, sturdy and durable.Specification:Item Type: Motor TachometerMaterial: ABS, Stainless SteelWorking Voltage: DC 7-30VPlug: US Plug 100-240VHall Sensor Wire Length: Approx.2m/78.7inDisplay: 4 DigitsAlarm: 50dB Sound and Light Integrated.Package List:1 xMotor Tachometer1 x Power Adapter1 x Accessory