Testo 0602 0393 tc type k surface probe for 435 hvac and iaq meters testo 0602 0393 p this type k probe is suitable for use with a number of testo products requiring a k type sensor the probe is designed as a robust but fast reacting probe for measurement of surface temperature up to 300 deg c at the probe tip 500 deg c for short term measurements p p the unique sprung thermocouple strip design allows accurate measurement even on uneven surfaces the probe has a fixed cable of 1 2m