The CL900 Electrical Tester Is An Auto-Ranging, True Root Mean Square (TRMS) Digital Clamp Meter. It Measures Ac/DC Current Via The Clamp and Measures Ac/DC Voltage, Resistance, Continuity, Frequency, Duty-Cycle, Capacitance, and Tests Diodes Via Test-Leads. It Features A Low Impedance (Loz) Mode For Identifying and Eliminating Ghost or Stray Voltages, and Has A Dedicated Mode For Capturing Inrush Current.