How much does this cost to the nearest dollar?

BALDR U.S. Electricity Usage Monitor for Home - Kilowatt Meter Sockets - Watt Meter that Plugs into Appliances to Measure Energy Usage - Home Energy Monitor with Easy to Read Display - Single Tariff
KNOW WHICH APPLIANCES ARE DRIVING UP YOUR POWER BILL Plug this electricity meter into your appliances to see their true efficiency. Our meter can measure voltage, wattage, current strength, CO₂ usage, electricity costs in kilowatts per hour, and more — in real-time. Now you’ll know if it’s time to replace that old dryer with a new energy-efficient one. PROTECT YOUR VALUABLES FROM A POWER OVERLOAD This electricity meter comes with overload protection, which notifies you when the unit is drawing more electricity than a circuit can safely handle. “

Price is $21.00

Price: $20.95