Based on the same system as the direct mounting exhaust thermometers. The case is filled with a shock absorbing liquid of high viscosity. 3 types of case configuration are available; wall bracket, rear flange or U-clamp for panel mounting. Approved by German Lloyd Certificate No.12 027-98 HH. When ordering, please specify the capillary length according to the customers needs, in addition to 6 digit IMPA code number.