Amazon.com has a P3 International Kill-a-Watt Electricity Usage Monitor for $28.49 after 5% off electronics coupon “CECUSTAPPRCT” with Free Shipping.
n- n
- Compatible with inverters; designed for use with AC 115-volt appliances n
- Electricity usage monitor connects to appliances and assesses efficiency n
- Large LCD display counts consumption by the kilowatt-hour n
- Calculates electricity expenses by the day, week, month, or year n
- Displays volts, amps, and wattage within 0.2 percent accuracy