DollaTek DC 8-24V 4 Digital LED Tachometer RPM Speed Meter with Hall Proximity Switch Sensor NPN 10-9999RPM

Specifications:Measurement accuracy: ± 0.1%Display mode: 0.56 “LEDDisplay update rate:> 3 times / secWorking power supply: DC8-24V, 30mA, measuring range: 10-9999RPMHall proximity switch: magneticAppearance size: 80 x 42 x 25 mm / 3.14 x 1.65 x 0.98 inchesLED display (optional): red, blueWeight: 80g (red), 105g (blue)Overrange display: The first display shows “1” or “-1” and the last three are not displayedPrecautions:1. If strong electromagnetic interference is to be avoided, it is better to use shielded wires or double rope wires to measure conductors2. The count signal of the counter and the switches of the zero clear signal input or the circuit must be as close as possible to the terminal of the counter in order to make the signal line as short as possible3. Avoid using others like: high voltage wires or power cables and so on with the same tube or twisted track line to avoid unnecessary interference. If necessary, please use the shielded wire, shielding layer connect the “+” of the counting terminals4. It is not recommended to use a mechanical switch or microswitch as these have a relatively short life and can be erroneously counted after a long time. If you use a mechanical switch or a microswitch, please try to use a better quality so as not to be misunderstood and suggest a magnetic control switchDelivery content:1 x speedometer1 x Hall NPN proximity sensor