Watts up?
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Watt's up displays the following information on the LCD:

Cost, in dollars and cents            Average monthly cost            Power factor
True power                                    Average monthly kwh           Minimum RMS (root mean square) voltage
Cumulative power (kwh)              Maximum RMS voltage        Minimum RMS current
Time                                               Maximum RMS current        Minimum wattage
RMS Voltage                                  Maximum wattage                Duty cycle
RMS Current                                  Power cycle (PRO)                 Frequency (Hz)
Apparent Power
                                                                        
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Simply plug any device into Watts up? and the meter instantaneously displays the wattage being used, as well as the cost, in dollars and cents.  Watts up? provides lots of information yet it is simple to use.  Only 6 values are displayed in the main modes.  Additional information is available in the detail mode.  Clear English wording (not abbreviations) on the LCD is used to describe what is displayed.
     Our Price:
 $95.95
Watt's up? measures voltage and current thousands of times a second so it has an incredibly fast response time which enables you to "see the surge" of power when appliances are first turned on.  The peak value display captures this surge so it is displayed even if it happens too fast to see live.  The minimum RMS voltage display shows the line quality and voltage dips.  Minimum RMS current and minimum watts can be used to monitor variances in appliances that run continuously.
 
Watts up? measures true power (including power factor).  True power is what utilities charge for, which can be different than a simple voltage and current measurement (this is called "apparent power").  The duty cycle display shows the percent of time a load is above a preset threshold level.  For instance, this threshold can be set to 100 watts and with a refrigerator the duty cycle display will show the percent of time that the compressor is running.  A high reading may indicate a bad motor or low freon.


Wired Magazine:
Rated 4.5 stars out of 5, Wired's Gadget Lab gives Watts up? the highest rating of 4 meters that were reviewed, earning it the SPLURGE award!
Specifications For Watt's up? Meters

120 v, 60 Hz, 15 amps
+/- 1.5%, + 3 counts of the displayed value

Below 60 watts, amps and power factor lose accuracy.

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Higher ratings of 100-277 v, 50/60 Hz, and 20 amps require appropriate country specific cord set and receptacle, and is NOT UL listed.
Internal electronics are the same.
Mains supply voltage fluctuations not to exceed +/- 10% of the nominal voltage
Rate can be entered from $0.001 to $85.00 per kilowatt hour, in tenths of a penny
Input is via 6' electric cord, output is via outlet on top of meter
Indoor use only
Dimensions: 7" x 4" x 2" (18cm x 10cm x 5cm)
Weight: 1.5 lbs (0.7 kg)
UL Listed (domestic version only)

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For UL rating

Watts up? is UL listed to standard UL 610010-1, and CAN CAS/C22.2 61010-1 (domestic version only)
Altitude up to 2000 meters
Temperature 5 C to 40 C
Maximum relative humidity 80% for temperatures up to 31 C decreasing linearly to 50% relative humidity at 40 C
Installation Category II