Plug-in Meters Reviewed

Plug-in meters are the easiest of all electric meters to use.  Simply plug the meter into the wall outlet and then plug the appliance to be measured into the meter. The display will show the power used in watts.  Over time, the energy used will be recorded as kilowatt-hours.

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Basic plug-in meters may also display min/max voltages, line frequency, current and/or power factor.   Most units allow basic electric bill rates to be programmed so you can see what it costs to run an appliance.

Corded plug-in meters have a faster sampling rate and can be used to measure the higher European voltages using a universal plug.   Some models can record data, others can communicate that data via the Web and have remote on/off capability.

These meters are inexpensive and very useful for measuring small loads.  However, they will not give you a complete picture of your home energy use.  Combined with a whole house metering system they will allow you to build a very accurate inventory of all the electrical loads in your home.  Using our home energy audit, we'll show you how and why this is an important step toward reducing your energy bill.

Basic Plug-in Meter Features

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Purchase Killawatt P4400


Purchase Killawatt P4460-EZ


Purchase Killawatt P4480 w/Graphic Timer


UPM EM 130 Plug-in Meter
Model Kill A Watt
P4400
Kill A Watt
EZ P4460
Kill A Watt
P4480 w/
Graphic
Timer
UPM EM 100
Operating
Voltage/Hz
115 VAC
60 Hz
115 VAC
60 Hz
120 VAC
60 Hz
120 VAC
60 Hz
Max Load
(VA or Watts, Amps)
1875 VA,
15 A
1875 VA,
15 A
1875 VA,
15 A
1800 W,
15 A
Voltage
Display
80 V to
125 V
80 V to
125 V
80 V to
125 V
80 V to
130 V
Current
Display
0.2 - 15.00 A 0.2 - 15.00 A 0.01 - 15.00 A 0.01 - 15.00 A
Current
Resolution
+/- 0.2% Typ. +/- 0.3% Typ.
+/- 1.0% Max
+/- 0.2% Typ. N/A
Power
Display (Watts)
0 - 1875W 0 - 1875 W 0 - 1875W 0 - 1800W
Power
Resolution
+/- 0.2% Typ. +/- 0.5% Typ.
+/- 2.0% Max
1 W N/A
Energy
Display (KWh)
0.01 - 9999.9
KWh
0.01 - 9999.9
KWh
0 - 9999.9
KWh
0 - 9999.9
KWh
Energy
Resolution
+/- 0.2% Typ. +/- 0.5% Typ.
+/- 2.0% Max
+/- 0.2% Typ. N/A
Power Factor
Display
0.01 - 1.00 0.01 - 1.00 N/A N/A
Frequency
Display
Yes 47 - 63 Hz N/A N/A
Cost/
Rate Input
Single $/KWh
Flat Rate
Single $/KWh
Flat Rate
None Single $/KWh
Flat Rate
Peak Load
Identifier
No No No Overload
Warning
Time
Range
0:00 Min -
9999 Hrs.
0:00 Min -
9999 Hrs.
N/A N/A
Power
Consumption
N/A 10 W max N/A N/A
Dimensions
(Inches)
5.1 H x 2.4 W
x 1.6 D
5.1 H x 2.5 W
x 1.5 D
5.1 H x 2.4
x 1.6 D
N/A
Batteries Not Req'd. Not Req'd. 3xAAA for
Memory
AG-13 or L44
Button Cell (2)
Special Features 7-Day Timer
w/ Surge
Protector
Overload
Warning
Documentation Brochure

Manual
Brochure

Manual
Brochure User Manual

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Corded Plug-in Meters

Moving up a notch in sophistication are the corded plug-in meters manufactured by Watts Up, Inc. in Orem, Utah.  These electric meters are rated for 100 to 250 VAC and 50/60 Hz so they can be used in Europe with their universal outlet option.  USA models are rated for 120 VAC only.

Sampling rates for these units are faster than the basic plug-in meters and they have the ability to record history.  The standard Watts Up model simply measures the load connected to it.  The PRO and ES models can log data and connect to your computer via USB.  The .Net model has Internet connectivity so you can monitor the load remotely and even turn it on and off.

Corded Plug-in Meter Features

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Watts Up Std. Corded Meter


Watts Up Pro Corded Meter


Watts Up Pro Corded Meter


Watts Up .Net Corded Meter
Model Watts Up? Watts Up?
PRO
Watts Up?
PRO ES
Watts Up?
.Net
Operating
Voltage/Hz
100-277 VAC, 50/60 Hz
120 V,60 Hz US
A
Max Load
(Amps)
20 A Max,
15 A Cont.

Voltage
Display
RMS Voltage
Current
Display
RMS Current
Power
Display 
True Power
VA
Display
0 - 2000 VA
Power Factor
Display
0.00 - 1.00
Frequency
Display
50 or 60Hz +/- 0.1 Hz
Accuracy
Range
+/- 1.5% + 3 counts
For example 100W load is +/- 1.8 watts

Min/Max
Readings
Volts, Amps & Watts
No Time Stamp
Cost
Display
Single $/KWh
Flat Rate
Flexible
Interval Setting
No Yes Yes Yes
PC Interface,
Software Included
None USB USB Ethernet
Records Stored
in Internal Memory
None >2,000,
>30,000
watts only
>8,000,
>120.000
watts only
>8,000,
>120.000
watts only
USB Interface w/
Logging Capability
No Yes Yes Yes
Remote Power
Switching
No NO No Yes
Internet Enabled w/
Web Server
No No No Yes
Internet
Subscription
N/A N/A N/A Depends Upon
Speed of Data
Dimensions/
Weight
7"H x 4"W x 2"D
1.5 Lbs.
Documentation Manual
 (Applies to all units)

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If you have developed a plug-in meter or know of one that is commercially available in the U.S. which is not listed here, please contact us if you would like to have it evaluated for inclusion on this site.




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