AT values may vary between companies depending on the test coil used. This chart shows a conversion between AT values using an OKI coil and a MEDER electronic coil. For example: A 30AT ORT551 Reed Switch tested using a MEDER KMS-01 coil will convert to approximately 24AT using the OKI #10 test coil. As described in an earlier slide, MEDER has converted their products to millitesla, thus providing a universal measurement standard to customers. However, the issues described above will not be eliminated until all reed switch suppliers convert to using millitesla as their standard magnetic measurement unit.