Four channels (insulated) per probe. Detection of 60~150Vac, 170~250Vac, 20~150VDC & 70~250VDC in 2 ranges. Response time slope rise 1ms, fall 3ms. Max input low range 150V rms, high range 250V RMS. Max rated voltage to earth 250V rms. Connector cable 1.5m. Probe tip cable 1m.