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Reliance Controls Corporation THP103 AMWATT® Appliance Load Tester / Plug-in Ammeter and Wattmeter.

4.7 out of 5 stars 121 customer reviews

List Price: $39.99
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  • This unit is cUL listed
  • Accurate digital readout from 1.0 - 15.0 Amps and 125 - 1875 Watts.
  • Long 26" cord reaches to remote electrical outlets.
  • Easy slide-switch action instantly converts between Amps and Watts.
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$24.97 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com in easy-to-open packaging. Gift-wrap available.

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Product Description

Product Description

Reliance Controls THP103 AMWATT Appliance Load Tester / Plug-in Ammeter and Wattmeter. Gives instant accurate reading of wattage and amperage used by household appliances. Reads from 1-1875 watts. 26" cord. cULus listed. Since 1909, Reliance Controls Corporation has contributed more innovations that any other single manufacturer and has been awarded over 85 patents on manual transfer switches, time switches and accessories. Reliance Controls Corporation specializes in the manufacturing of a wide variety of electrical products. The primary product line consists of heavy duty time clocks and controls, generator accessories, transfer switches and transfer panels for portable generators. and inverters. And after over a century of innovation, Reliance Controls Corporation has built an enviable reputation for high quality, superior engineering and exceptional customer service.

From the Manufacturer

AmWatt Plug-In Digital Appliance Load tester. Only tester of its kind that gives a quick digital readout of Amps or Watts used by any plug-in appliance. Eliminates the need for expensive clamp-on meters and line splitters. Perfect for choosing the correct portable generator to purchase. Easy to use: 1. Plug appliance or light into AmWatt, 2. Plug the AmWatt into any 15A electrical outlet, 3. Turn ON the appliance or light. UL listed.

Product Information

Technical Details

Part Number THP 103
Item Weight 12 ounces
Product Dimensions 8 x 2.5 x 11 inches
Item model number THP103
Color Blue
Power Source corded-electric
Item Package Quantity 1
Certification certified frustration-free
Warranty Description 1 Year

Additional Information

ASIN B000G7TKCG
Customer Reviews
4.7 out of 5 stars 121 customer reviews

4.7 out of 5 stars
Best Sellers Rank #16,208 in Home Improvements (See top 100)
#60 in Patio, Lawn & Garden > Generators & Portable Power > Generator Accessories
Shipping Weight 12 ounces (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available February 17, 2007

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Anything that uses an electronic ballast (light the compact fluorescent lights - CFLs) will not work with this device. That's because the device looks at the peak current to figure out the watts. For example, a CFL that actually uses 13 or 14 watts will erroneously show up as using 65 watts. That's because the crappy meter sees a maximum of 0.5 amps of current, but most of the time the CFL is drawing much less current. This device only refreshes about twice a second and cannot see a current that is pulsed faster than that. It will work fine for anything that uses a constant level of current, like a fan, toaster, etc. Also keep in mind that the packaging itself says it is only accurate from 125 - 1875 watts. That means anything using less that 125 watts might not show up very accurate. There are much better devices out there, like the Kill-a-Watt.
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I read all the reviews for this product and I felt pretty comfortable purchasing this item and that it would do as I wanted it to and was described to do. Before I purchased it though I talked to an electrician friend to find out what he uses on the job... well although I believe in buying brand name which usually cost a little more, the tester he uses was way out of the ballpark as far as price was concerned. So I bought this one, more for making sure I wasn't overloading a generator, but also to find items that were using electricity even though they were turned off.

I was surprised to find out just how many things actually still use electricity even though they were off and there were no visible lights indicating they were on or plugged in, for instance all four of the DVD player in my house use 5 watts each just to be plugged in, something my electric company calls "Phantom Usage". To have a cell phone charger plugged into the wall but not into the phone, they say is costing me $1.00 per/mth without actually charging the phone, the same holds true with other like items that use A/C Adapters. The most surprising saver came after I had a Home Energy Audit, when the home inspector told me it was cheaper to run the old tube tv's than it would be to upgrade to flat screen tv's... There suppose to recommend ways for people to save electricity and what updates would benefit the house. After buying this tester I tested the old tv's using 300 watts, the new flat screens only 46 watts just as it says on the TV box. I've upgraded all 4 tv's and immediately notices a $150.00 drop in my electric bill.

Back to the main reason I bought it...
Read more ›
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When sizing for a generator or an inverter you need to know not just the wattage used but the peak or surge watts used. Some items like air conditioners and refrigerators and lots of others will draw a lot of power when they first start up, then quickly settle down and use less while they run. Your power source has to be able to handle the peak usage which can be 2 or 3 or more times the normal running usage. If you want to power several such items, your power source has to be able to handle the peak usage for *all* of them since eventually they all may coincidentally crank up at once.

I have a massive, ancient vacuum cleaner that is a great example of this. When I fire it up, the lights in the room dim slightly for a few seconds, then return to normal. That's the surge draw of that old vacuum starting up.

Anyway, this little goodie lets you see the watts (or amps) being drawn by an appliance. However, it shows you the watts drawn in real time which doesn't tell you the peak which is what you need to generator/inverter sizing. When you're ready to check out the peak watts of the item you're testing, sit and watch the display carefully and make a note of the highest value shown as the item is starting. Even if the wattage drops substantially after that, the high (peak or surge) wattage is what you need to be able to support. If you just look at the display after the item has passed its startup surge, you're looking at the lower, normal draw. So pay attention and you'll find this to be very handy. It can either tell you that you need to spend more on your power source or replace some particularly power hungry older item (like my vacuum).
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My house almost caught fire while I was on vacation.
I had too many electrical appliances on one circuit . luckily, my best bud stopped over to feed my cats & saw the house was full of smoke.
He carefully looked for the source & saw a plug smoking which burst into flame as he watched.
He unplugged the source cord, opened the windows and saved my home from burning down.
I thought the fuse on the power cord would protect me....WRONG !
With this tester I have kept the amps down to a safe level on each of my outlets.....
This tester should be in everyone's home...IT REALLY WORKS !
Very simple to use.
I give it 5 stars !
3 Comments 17 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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This device is the quickest and easiest way to measure how much power your appliances consume. If you are purchasing a generator, you need to know the acceptable load. Some things I learned include my refrigerator and chest freezer consumed less power than I thought. The big power buster was Mr Coffee, which I did not expect. Computers and TVs will run on generator as long as the load is correctly calculated. You plug this device in the wall, and plug the other end in the appliance, and after the unit under measurement cycles a couple of times you can determine and write down the power it consumes. It will show the highest power consumed over the appliance cycle and retain the reading in amperes or watts until you unplug it.

So if you are buying an emergency generator, go around and record the power off all your necessary appliances, and buy a generator that can handle that number plus 30% more and you will be okay.

If you are looking at that old refrigerator you may find that you can save some money by replacing it and using far less power. You may also find you are wasting a lot of power by leaving those computers and peripherals on instead of shutting them down.
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