... measurement 3 alarm outputs,optical isolation Range:0.01Hz--100KHz(max 100KHz) Accuracy:0.01Hz. Digital 4/5/6 LED Frequency Meter ... output,high anti-interference.4, Output:up to 3 alarm output with various output modes selectable:high value,low ... manufacture thousands of different models of products, including Temperature Controller, Digital Adjustor,thermocouple (TC and RTD), Panel Meter, Sensor Meter ...