The so-called HELIX is covered by the EN 867-5 European Standard. This is a test body for "Class B" steam sterilizers, which simulate the complicated requirements for sterilizing hollow instruments. The test body is required for batch monitoring of the processing of "critical B" instruments. MELAcontrol is supplied with a tester and 250 test strips. If the test strips are consumed, new test strips are supplied with a newer test body and the old test body will be disposed of.