Like the Laser Flash Method, the Hot Disk Method is also a non-destructive test which can be completed in a matter of seconds. It is also advantageous for measuring over a wide temperature range, from -160°C to 1,000°C and can test thermal conductivity in a range from 0.005 to 1800 W/Mk. The disadvantages to the hot disk method include the following: first, each testing sample must have one entirely planar side to ensure good contact with the sensor, which is difficult for certain materials. Second, errors in measurement can come from several sources as this method requires considerable experience to be able to perform accurate measurements. For instance, changing parameters like the size of the sensor, the proper protective isolation film on the sensor, and the length of time to run the test can largely influence the results. These challenges result in ambiguity and problems with repeatability amongst labs.