The BM15 & MJ15 are compact 5 kV insulation testers. They are very simple to use and provide a quick and accurate reading of insulation resistance. The instruments use an analog display with a maximum reading of 20 Gohm.

A voltage range of four test voltages enables measurement of ac or dc conductor potential. The four test voltages available are 500 V, 1 kV, 2.5 kV and 5 kV. The instruments are supplied with a locking or non-locking test button. The locking button allows hands-free testing, the non-locking button is recommended to prevent accidental mis-use and injury.

A bezel allows a scale plate overlay to be added with PASS/FAIL bands for GO/NOGO testing. This is particularly useful for less experienced users and enables a rapid decision to be made. The new instruments have a choice of power source, eight x LR6 (AA) alkaline cells or the MJ15 offers an additional hand cranked generator. If the test button is pressed the MJ15 uses battery power. Otherwise the crank handle is turned to save battery power or for use when the batteries are unavailable. Both units are built into a rugged case designed for outdoor use.