Have good stability, high measurement precision.<br> Strong anti-jamming capability.<br> Setting parameters will be memorized when power off.<br> With a standard size, easy to install.<br> Suitable for detecting the speed of every kind of motors.<br> Specifications:<br> Power requirement: DC 8-24V<br> Measure range: 10 ~ 9999RPM<br> Error range: 0.1%<br> Clear zero: Automatic<br> Clear zero time: About 10s<br> Refresh frequency: 0.2-0.5S(120-1200RPM),0.25-0.06S(2400-9999RPM)<br> Response frequency: 100HZ.<br> Measure indication: (RPM Less than 5000,2),(RPM more than the 5000,3)<br> Sign: NPN 5 wires normally open.<br> Display: 5 x 2cm LED<br> Detection range: 1mm-10mm.<br> Proximity output current: 20mA(For the sensor)<br> Operating temperature: -10 to 50 Celsius<br> Sensor wiring: brown(Power+), black(Test+),blue(signal)<br> Colour:black<br> Material:plastic<br> Package Contents:<br> 1 * Tachometer RPM Speed Meter<br> 1 * Hall Proximity Switch Sensor NPN<br> Only the above package content, other products are not included.<br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.