Adapter for connecting meters with RS-232 output or optocoupler to the USB port of the computer: MIE-500, MIC-2500, MIC-1000, MRP-120, MRP-200, MZC-301, MZC-303, MZC-303e, MRU- 101, MPI-510, MPI-511, MMR-600, MMR-610, MMR-620, MMR-630, MIC-5000, MZC-310S.