Best in 7 days
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Description
Graigar 4 in 1 Digital Multi-function Tester DY5500 AC 600V Voltage Measurement Test Multimeter 2000Mohms ResistanceBrand: Graigar Features: DY5500 Muli function tester ground resistance measurements from 0. 01ohm to 2000ohms with 0. 01ohm resolution Auto ranging, data hold, LCD backlight AC voltage measurement to 600V Check phase sequence and phase status Test voltage 250V, 500V, 1000V Part Number: DY5500 Details: Features: Ground resistance measurements from 0. 01ohm to 2000ohms with 0. 01ohm resolution Measure insulation resistance to 2000M ohms Test voltage
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.5 ★★★★★
Based on 989 reviews
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Product Reviews
★★★★★ 5
My favorite desk item
Color: Wood
I love my coffee but it must be hot-every sip! I'd get up at work so often to go reheat my coffee in the nuker & don'tlike the microwave AND a hater coworker even commented to me that she noticed "how much I get up from my desk" so I thought, they gotta be making coffee hot plates for desktops these days & boom, they do!! I like the wood finish, right my aesthetic alley. The plate has 3 settings; high, medium & low. Even has an auto shutoff after..idk how many hours so built in safety. I've even put my ceramic cup of soup on there to keep it warm while I work through lunch a couple times & it worked for my soup on the high setting. Coffee goes to medium when I first get in since it cools on the car ride over & then down to low once it's hot again. Will be getting one for the home office here soon.
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Reviewed in the United States on May 2, 2026
★★★★★ 5
Mug warmer
Color: Wood
This is a well made mug warmer, heats up quickly and convenient to use. The heat ratio is high making it easy to select the level of heat one wants to have to enjoy their coffee, tea, hot chocolate, etc. The only default I have with this product is how to turn on the warmer. It's convenient but if something is sitting next to the warmer, the warmer turns on too easily. I would recommend the manufacturer use some type of switch to turn on, adjust and turn off the warmer due to the chances of heating something up that was not intentional!
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Reviewed in the United States on April 26, 2026
★★★★★ 5
Simple and very useful
Color: White
Right out of the box it works just as expected, gets perfectly hot. Even with a small cup, my coffee typically cooks to quickly for my taste. Jumping up to give it a pop in the microwave gets old fast. Problem solved. For already hot coffee, the low is enough to keep it sippable. I'm pretty sure I could hear a can of soup from room temp on the high setting. I do hope it is doable because this is a perfect hot plate.
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Reviewed in the United States on April 22, 2026
★★★★★ 4
Works great but design flaw.
Color: Wood
Works great. 3 settings. The first is HOT. I usually use the middle or low setting and they keep my cup warm and drinkable. There is a flaw though with this device. The warming button is so easy to touch /come on that several times on my desk, it has come on without me realizing it from paper hitting it, a pen rolled against it or simply moving it over and it is on highest setting when it comes on so I have burned my fingers now twice. I just always double and triple check it isn’t on.
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Reviewed in the United States on February 14, 2026
★★★★★ 5
Powerful Mug Warmer with Excellent Heat Output and Large Heating Surface
Color: Wood, Color: Wood
CAUTION: Unplug when not using. It is very easy to activate or turn on by mistake. Simply brushing up next to it will turn it on.
Nonetheless, I use this SWEETFULL coffee mug warmer every morning and afternoon. It’s usually one of the first things I turn on so I can preheat my latte cup before pulling espresso. I like my lattes very hot, and preheating the cup helps prevent heat loss during extraction. I also use it as a candle warmer as an alternative to open flame, which I prefer for indoor air quality.
The heat output is impressive. Even on the lowest setting, it gets very hot and reaches usable temperature quickly. The large heating surface is a major advantage. My latte and cappuccino cups have a wide mouth, and this warmer heats the entire base evenly rather than just the center, which makes a noticeable difference in temperature retention.
Warm-up time is reasonable, though slightly faster heating would make it even better, especially during busy mornings when I’m trying to get out the door. That said, it’s not slow enough to be a real drawback, and once it’s hot, it performs consistently.
Overall, this is a strong performer that does exactly what it’s designed to do. It’s a great option for coffee lovers who want hotter drinks for longer, and for candle users who prefer a flame-free, cleaner alternative inside the home.
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Reviewed in the United States on February 22, 2026
