A borescope, videoscope or fiberscope can typically handle temperatures of up to 176° F (80° C).
This temperature limit applies to the flexible insertion tube. Once this borescope temperature limit is reached the internal components begin to break down. The operator must keep in mind the environmental conditions that the video borescope is to be inserted into. It is very common for a videoscope to be damaged from exposure to too high a temperature. Many applications such as inspecting steam turbines, gas turbines or welds in purity piping require that the inspector wait for the inspection area to cool down to acceptable limits. Remember that if you cannot place your hand on the area that you want to inspect do not insert your videoscope. For some applications it may be advisable to use a thermometer to determine internal temperatures prior to beginning an inspection.
The iTool Videoscope is unique in the fact that it is able to withstand higher borescope temperature limit of -13°F to 176°F (-25°C to +80°C) (284°F/140°C less than 5 Minutes)