To how many decimal places does this one display for Watts?

This EZ model does NOT display how many Watts you device is pulling... It displays how may kwh have been used thus far, to the 1/10th decimal place. So, when you first plug something in is shows ZERO, since not enough time has passed to show kwh used yet. This is a HUGE feature left off this device. For me, I want to plug something in to a meter like this and be able to instantly see how many Watts the device uses, and this EZ meter version does not do that.

Can it be set for a period of time (such as 24 hours) and record usage only then?

Yes, this records the total power used by the device whether it is on or off or any mix. You just need to go to the screen kwh used. record the beginning # and at the end of time period (say 24 hours) record the end #. that is how many kwh it used. I used several of these for months to record the A/C use in our shared apt and paid the landlord for the a/c used so they don't complain about my electricity used. great device. now however, my apt has a 20a a/c wall unit. while you could get converter to regular 3 prong, not sure if this unit will go to 20 amps.Others who said no are simply ignorant of this devices menu. It ALSo shows, when on watts menu, the watts used when a device is running, or is off. so you can see how much your a/c or toaster oven or giant screen tv uses when on, or off.It also keeps the power kilowatt hours used even if unplugged or power goes out in its internal memory. so you can simply record the kilowatt hours at the begin of a month, then at the end of the month, subtract and multiply by your cost of electricity for the total $ / month the device uses.The dork who was our landlord at the time thought his electric water heater for tea was less expensive to use than nuking a cup of water for a minute to heat it up in the microwave. popped this device on it and they were almost identical in total power used to heat a cup of water.The same idiot who was complaining about this left his rear projection tv on when he wasn't around, and they use alot more electricity than today's flat panel screens.If you want to record the power usage of some device over time, you'll want to plug this device into a short extension cord. if you plug it directly into the wall then you have to lie down on the floor to read the kilowatt readings. I just put the readings into a spreadsheet when I was recording monthly electricity usage.

does this work on 220v 60hz house outlet

As others have said, no, it does not. However, the Poniie PN2000, which you can find here on Amazon for ~$25, WILL do 110-230V input up to 16A. That's the one I'm probably going with...

Is this model 220v (Non US) AC compatible? If not, which model is? Thanks in advance

This is a 120-volt meter. I recommend that if you want a plugin meter than can handle 240 volts you look one for the appropriate electrical receptacle on the front. This one clearly has a standard 120-vold outlet receptacle.

Brand	P3
Special Feature	Energy Efficient
Color	grey
Form Factor	Tower
Indoor/Outdoor Usage	Indoor
Product Dimensions	3.81"D x 5.72"W x 12.7"H
Recommended Uses For Product	Home
Mounting Type	Wall Mount
Room Type	Living Room
Burner type	Radiant
Fuel Type	Electric
Voltage	125 Volts
UPC	731215344275 872182724360 115970738560 168141408564 809190598300 163121121341 809386512523 727558621760 806296606182 182682430372 809187157503 807034919304 001910683093 807031792726 100177522586 801200954021 872182760955 765042440862 782386050090 132017979458 795971978471 041114745692 807320370659 104727329366 754262034609 041114435654 805095150674 168141348822 617407346732 854587166921 611101596691 803982965578 885417245028 803982965974 999998403729 680808345925 751549044603 956263155967 151903475874 971475303531 809390037661 887165579837 163120863921 172302656046 806293943563 014444641989 611101200598 881110016965
Global Trade Identification Number	00751549044603
Manufacturer	P3 INTERNATIONAL
Part Number	P4460
Item Weight	6.4 ounces
Item model number	P4460
Batteries	1 AA batteries required.
Is Discontinued By Manufacturer	No
Size	1 Pack
Style	1 Pack - Model P4450
Material	Other
Pattern	Monitor
Amperage Capacity	15 Amps
Item Package Quantity	1
Number Of Pieces	1
Display Style	LCD
Special Features	Energy Efficient
Usage	personal
Included Components	usage monitor
Batteries Included?	No
Batteries Required?	No
Battery Cell Type	Alkaline
Warranty Description	1 Year Limited

P3 International P4460 Kill A Watt EZ Electricity Usage Monitor , grey

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