Extech ex830 current clamp 4000 counts cat iii 600v extech ex830 p the extech ex830 is a current clamp on ammeter with a built in infrared thermometer this allows you to perform a contact free detection of the temperature current of cables bus bars and so on using a single device the robust devices each come encased in a moulded soft rubber protective housing and are equipped with automatic range selection as well as a quick peak hold function enabling the reliable measurement of star