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Measuring accuracy: +/-1.5%, +/- 2 word
Measuring range: AC 80-300V (110V, 220V)
Consume power: Less than 1W(about every 1200hours consume 1 kilowatt-hour)
Plug Style: US Plug
Number of Digits: 3 Digits
Potentiometer adjusting method:
Please use the Phillips screwdriver to open the outer case of the voltmeter;
then adjust the potentiometer with small size Phillips screwdriver.
If the displayed voltage is too high, please adjust potentiometer counter-clockwise;
If the displayed voltage is too low, please adjust potentiometer clockwise.
Application:
The monitor can be widely applied in AC 80-300V mains measurement, such as office, factory, laboratory, household and so on.
-You can use this item in RV as a way to view voltage to prevent issues with appliances.
-You can use this item to monitor the voltage of other appliances; when this volt gauge displays too high or too low voltage, you can selectively turn off your appliances or equipments so as to prolong the life of your appliances.
Notice:
Keep the children away from the product.
Do NOT use the product in a damp environment.
Package Includes:
2x Voltage Test Meter
Jerry M
Reviewed in the United States on February 14, 2025
Purchased DROK Voltage Test Monitor, 2 pcs Plug in Digital Volt Meter one week ago. Works as described. Bought one for my RV and home (bigger RV). Very bright display easy to read. Appears to be accurate as I checked it against my multi meter. Monitor showed 119 volts and multi meter showed 119.2 volts. Time will tell how long they last as the back light is a constant on. Works for my purpose. Based on my initial short experience with this I would recommend.
Jimbo
Reviewed in the United States on January 14, 2025
Simple and convenient way to keep an eye on campground voltage supply
Todd M
Reviewed in the United States on June 15, 2024
Have on my boat to check voltage on shore power in marinas so my equipment works well and is not damaged due to under voltage.
andrericher
Reviewed in Canada on May 3, 2024
Petit mais bien pratique pour surveiller la tentions du courant au camping.
Sebastian Hahn
Reviewed in the United States on November 24, 2024
It's a little bright. I was originally going to put it in my bedroom, but aside from being a little too bright. it's also hard to read from the other side of the room. Instead, I put it in the bathroom (there's an outlet above the counter there), and I've made a habit of glancing at it any time I enter the bathroom for any reason.This works pretty well, and now I'll be able to monitor for extended surges. (I've had extended surges a few times before which I caught by chance, and wanted to monitor to see if it's something which happens often, as this could damage home electronics).
kstev99
Reviewed in the United States on August 27, 2023
My RV has a generator that works great, but just one problem: It is very hard when driving the RV to tell if it is running or not. I mean, there is an hour meter on the dash that clicks every 30 seconds or so, but you cannot see it or barely hear it when driving.This little voltage monitor was just what I needed. I plugged it into an electric outlet near the passenger side floorboard with a 90 degree adapter to make the display face me while driving. Now when not plugged into a power source the display is blank. Start the generator and voila, I have an indicator that is easy to see whether or not the generator is running. Peace of mind that food in the refrigerator won't be spoiled when I arrive at my destination. Is it accurate? It seems so, but I really don't care about accuracy for my specific use. It just works !!!
Jomantra
Reviewed in the United States on April 16, 2021
Purchased two DM55-1 Digital AC Voltmeter/Voltage Test Monitors and received in less than a week. I purchased for use in a RV and for an inverter generator to monitor voltage. They are small....approximately 2-1/8" wide, 1-5/8" high, and 1" deep (not including the two electrical prongs on the meter, so it will extend out 1" from the electrical wall plug it is plugged into). The actual face of the meter display is 1-7/16" wide and 13/16" high. The meter display has nice dark black digits displayed against a nice deep blue background light, which should work as a dim night light too. The instructions on the box say the unit has an accuracy of +/- 1.5% and measures voltage from 80-300 volts AC. I checked both meters against a true RMS voltmeter and both gave the same reading as the RMS voltmeter. The meter display does not display tenths, just whole number voltage readings. While the box instructions don't give any information, the Amazon product details for this device say you can adjust the meter reading up or down if the meter is inaccurate. I did not have to do this since both meter's readings were accurate, but there are 4 small phillips screws on the back of the device that can be removed to access the potentiometer if adjustment is necessary. All that is necessary for the unit to work is to plug it in to a household electrical plug.....and it works. Nice to know the voltage for both my RV camper and generator to avert serious problems from too high or too low voltage. I am pleased with this purchase at this time!
Cornelius
Reviewed in the United States on August 10, 2019
This little voltmeter is a great value and I simply don't understand why anybody would want to spend more than they need to..As an electronics engineer let me assure you that the old adage "you get what you pay for" more often than not is nothing more than marketing hype.Let's be honest AC voltage meters aren't state-of-the-art technology it's actually been around for quite some time. My only real concern is safety as this particular meter does not appear to have passed any insurance safety standards testing as I did not see any certifications for UL/ ETL/ FCC/ CE..With that said it's such a simple device that I'm not overly concerned with it. Be aware that most homeowners and RV insurance policies prohibit the use of non UL for non ETL listed devices.In other words if the device causes a fire your insurance company can void your insurance and refuse to cover the damage.As such it's always wise to check with your insurance company and see what their policy is regarding the use of non UL, non ETL listed line-level products..I really didn't need this device as I have a complete Electronics lab full of very precise equipment but I'm kind of a test equipment junkie and was curious to see what I was going to get for five bucks..I have to say I'm relatively impressed, its accuracy is as good as anything I've seen at three times the price. As such I have no problem recommending it.The only problem with digital meters is that they react to slowly to see fluctuations in power levels. As such I always recommend using an analog gauge in combination with a digital gauge.The analog gauge will show you rapid fluctuations in voltage that can indicate a problem while the digital gauge gives you a reference of the instantaneous voltage. If you ever visit a nuclear power plant you will notice that they use a combination of digital gauges and analog gauges on the same measurements for precisely this reason.Anyhow the bottom line is it's well worth the money.
Daniel Harty
Reviewed in Canada on October 4, 2018
I’m very impressed with the build quality of this voltage monitor, I’ve used it for many hours already to monitor line voltage out of my variac it’s nearly as accurate as my expensive multimeter. The backlighting in the display is a nice feature also.
Steampunk Fan
Reviewed in Canada on July 18, 2017
Great product. Does exactly what we need. We have a park model trailer on the beach in an older (meaning less well serviced) part of a large trailer park on the Canadian shore of Lake Erie. Voltage drop, especially on summer weekends when the park is full, is a serious issue for our part of the park and despite continual pressure on park owners, unlikely to be resolved soon. So this simple device lets us know when not to use the microwave or other sensitive electronics. Very good value for money.
DEBY W.
Reviewed in Canada on February 13, 2016
Sweet little unitWorks as advertisedThis will help to monitor power levels in our trailer this coming camping seasonI tried it in the kitchen while running a large microwave and it did show a slight drop when it was turned on
D Phelan
Reviewed in Canada on June 29, 2015
Very handy item to have in your RV.. We had a heatwave and I was able to monitor voltage drop with ease. By having this product this last weekend I saved both my A/c's, my fridge and my laptop from damage. 103.5 v is min. for motors, reg's call for a min of 104.4 under load. Our park at the peak of the heatwave caused a drop in my RV to 100 v. GET ONE.
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