panel meter 1.SCM function 2.no alarm system 3.current watchcase 4.backup data for fail power panel meterfeature 1.current watchcase, volume delicate.2.measuring precision, performances reliable.3.using SCM function with high anti-interference4.ULF testing tachometer (15 times/min)5.backup data for power fail, keeping data 10 years6.counld be counting, speeding, frequency working in the same time ...