Geist Inline Meter - LCE-002C19-00C20. Update existing power strips with this basic inline power meter. By inserting the meter between the power distribution unit and the power source (wall plug) you can easily learn amps, volts, watts and power factor. The values are continually displayed in bright red LED numerals. C-19 input connector and C-20 output connector. Using these connectors the device is rated at 20 amp 120 or 208V.