... 3 alarm outputs,optical isolation Range:0.01Hz--100KHz(max 100KHz) Accuracy:0.01Hz. Digital 4/5/6 LED Frequency Meter ... used to measure power frequency(AC 0-- 600V),range:0.01Hz--100KHz(max 100KHz),accuracy:0.01Hz,Applicable to equipment for ... manufacture thousands of different models of products, including Temperature Controller, Digital Adjustor,thermocouple (TC and RTD), Panel Meter, Sensor Meter ...