Take this calibration box with you wherever you go to check the ongoing accuracy of insulation, continuity, loop and RCD testers. Built inside its own protective carrying case, the MTB7671 ensures that your tester remains accurate and within specifications during the time period between official calibration procedures. This makes sure that your tester operates safely and doesn't generate inaccurate results (ensures compliance with such bodies as the NICEIC, ELECSA and Corgi). Capable of checking the full range of a tester's capability and even includes colour coded sections for easy identification of testing procedures and clearly indicates whether the connected tester has passed or failed the test. The MTB7671 makes that an easy job. You can test the insulation resistance, continuity, earth loop impedance, PFC, RCD and voltmeter functions of you testers quickly and easily, recording the test results on the record cards included in the pack. There are also self-adhesive test labels