... -100KHZ 5V/24V DC power supply 2011---FM series Digital Panel Frequency/Tacho/Count Meter Features:1,Optional timing,counting ... ,Small size,with external terminal,easy installation.2,Input: Frequency: 0.01H--9999Hz,resolution: 0.01Hz. Various switch ... Meter, Coulometer, Voltage Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter, flowmeter, Timer, Timer Relay, Solid State Relay, Proximity Sensor ...