Panel frequency meter 4/ 5 digits display 0.1% F.S ... :1,Optional timing,counting,frequency and tacho measurement.Univeral panel,Small size,with external terminal,easy installation.2,Input: Frequency: 0.01H ... products, including Temperature Controller, Digital Adjustor, thermocouple (TC and RTD), Panel Meter, Sensor Meter, inductor, Power Meter, Coulometer, Voltage Meter, Ampere ...