This unit is a good condition Yokogawa CW121 Clamp-on Power Meter. Comes with a soft case, clamps, leads, all accesories, user manual, software disc, certificate of calibration dated March 03 2018 (will be re-calibrated upon purchase), and 90 day warranty. All functions are tested and guaranteed and all pictures are of the actual unit. 


This item comes with a 3 Month (90 day) warranty.  All functions are guaranteed to work or money will be refunded.

This item includes a 1 year NIST traceable CERTIFICATE of Calibration with data dated March 03, 2018 (to be re-calibrated upon purchase).

We Calibrate your Test Equipment! Contact us for more information on Calibration by visiting


For customers in the USA, all purchases arrive cleared. ALL brokerage or customs fees are prepaid by us.  Your item arrives FOB destination.


International Buyers – Please Note: Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying. For more information of clarification, please ask.


Will ship worldwide. We make our best efforts to get you the best shipping prices. Contact us for other international rates and we will be pleased to give you a quote. We accept VISA / Mastercard. Paypal is also accepted. Sales to within Canada are subject to 5% GST.  Ontario sales subject to 13% HST.

Yokogawa CW121 Clamp-on Power Meter with Clamps, Leads, Manual - NIST Calibrated

  • The Yokogawa CW120/CW121 power meter is a low-cost tool to support your energy conservation efforts. Yokogawa CW120/CW121 power meters are designed to meet user needs for simple tools capable of measuring power values and instantaneous values. Data can be saved as low as 1-second interval. This capability allows the Yokogawa CW120/CW121 power meter to respond quickly to load fluctuations and measure transient responses in equipment.

    The Yokogawa CW120/CW121 power meter has an instantaneous value filing function (enabling multiple data records to be saved in a single file when multiple measurements are taken) which is useful for determining equipment operating conditions. There is a wiring error check function which helps ensure that measurement operations are correct. Multiple CW120 Series units can start and stop integration simultaneously through externally controlled I/O. The Yokogawa CW120/CW121 power meter works even with small electric energy values. The decimal position (number of digits following the decimal point) and the display unit (Wh, kwh,MWh, GWh) are featured on the electric energy display.

    The setting software allows you to set the Yokogawa CW120/CW121 power meter's measurement conditions through a PC and save measurement data on a PC when the unit is connected to the PC through an RS-232 or RS-485 port. The Yokogawa CW120/CW121 power meter, in addition to proprietary communication, also supports MODBUS, PC-link, and Power Monitor protocols. PC-link is a protocol for Yokogawa's temperature controllers and PLCs.


    • Voltage measurements up to 495V
    • Supports single-phase 2-wire to three-phase 4-wire connections
    • Continuous measurement integration
    • Accurate measurements can be obtained even if there are large load fluctuations
    • Data saving interval can be set in the range of one second to one hour
    • 117 x 161 x 51 mm (W x H x D)
    • Large backlit display