The DeFelsko PRBFHXS-D PosiTector 6000 Cabled Xtreme High Temperature Probe FHXS Only, 250 C / 500 F, Measures Coatings on Ferrous Metals, 0-400 mils is used to measure non-conductive coatings on steel substrates. The FHXS Xtreme probe features Alumina wear face and braided cable for hot or rough surfaces. Hot surfaces up to 250° C (500° F).Certificate of Calibration (Long Form) traceable to NIST or PTB included with every probe. Compatible with PosiTector bodies with serial numbers greater than 700,000 and the new PosiTector SmartLink.