bayite Pack of 5 Three-Wire Calibratable DC 0~30V Red Digital Mini Voltmeter Gauge Tester Mount Car Motorcycle Battery Monitor Volt Voltage Meter 0.36" Red LED Display Panel

So far, I've only tried one, so I can't comment on the quality. The calibration is the only negative aspect of these. On the back, there is a pot that can be used to calibrate the device. However, if you calibrate it for 5 volts, it will be off at 12 volts, and vice versa. As a result, the accuracy isn't very good if you're measuring a wide range of voltages. These are better for checking for changes in a specific voltage. Also, I'm not sure how accurate the calibration is at different temperatures. But, once more. Each one costs two dollars. Advantages: br>br>
- a low pricebr>- The current is relatively low. It draws between 10 and 13 volts at 13 volts. 20 ma.
- a good amount of brightnessbr>contrary to popular belief, there are some disadvantages to this product.
- Only a small range is covered by the calibration screw.

Alfredo Colling

| Dec 15, 2021

  This is a fantastic little voltmeter! Calibration is simple and accurate; I set the 10ths digit to roll over to the next value when the input voltage reaches 0 by 3D printing a shroud and adding some smoky Lexan to cut the brightness down a bit and improve the contrast. 05V (i. a 12 volt input voltage The number 44 translates to the number 12. On the LED, there are four lights, and there are twelve on the incandescent. 45 is a 12-digit number. 5). Over the input range, the accuracy is excellent, and the 10th digit does not jump around too much. Overall, this is a very user-friendly voltmeter that will suffice for the majority of projects. I used it to measure power supply/battery voltage as well as boosted voltage in a mobile amateur radio setup. br>br>I wish the three wires were accessible so you could connect the white and red (voltage for the LCD driver and voltage to measure), but they are soldered to the PCB surface under the LED, which isn't a big deal.

Eliana Ward

| Feb 16, 2021

I've added a JST-compatible component to the mix. Connect a PH connector to one of them and use it to check the state-of-the-art-of-the-art-of For tiny RC toys, charge on 1S battery packs. br>br>I then put it in a shirt pocket, only to find it when I opened the washing machine door, which is obviously not recommended, but it appears to work. br>br>Does it necessitate a one-time payment? Adjust the calibration potentiometer over time while watching the same source with a more reliable meter (and probably not a bad idea after removing the clothes from the washing machine, too ;).

Lyric Howell

| Jan 14, 2021

I just did some reference testing with a calibrated meter. The reading needed to be tightened up a little. I was able to get it dead on at low voltages, but not so much at midscale; however, for important measurements, I'll use a professional meter, which will be kept on my lab supply (my meter is broken). The construction quality is a little shaky. I discovered that the display on the one I just tested is unevenly mounted to the circuit board, and I'm hoping that this is not the case with the others. I purchased the red displays, which are bright enough at 4 o'clock. The onboard voltage regulator keeps the brightness consistent at 5V, but I recommend avoiding higher voltages to prevent the regulator from being killed.

Zhuri Conway

| Jan 21, 2021

Wow, this is an incredible deal: The voltmeter gives an accurate reading of electrical potential in volts, and it's small enough to fit in a project box. It's also simple to connect: The color black is commonly used as a "ground" connection. The voltmeter's internal circuitry requires power, which is provided by the red wire. The voltmeter should not be powered by anything more than 30 volts, according to online information. The measurement-sensing connection is made with the white wire. The voltmeter gets its display value from this wire. The sensing input's internal resistance is extremely high, implying that it is a FET. The red and white leads can be joined to form a two-lead circuit. A wire voltmeter with a maximum measurement range of 30 volts is required. The white-wire input alone can tolerate a wide range of potentials, according to online data.

Isabela Johnston

| Aug 19, 2021

These small meters are ideal for the small projects that require low voltage monitoring that I always come up with. The display is surprisingly bright and clear, and having a separate lead to turn on the display when needed rather than having it on all the time is extremely convenient. The picture is supposed to be vertical and shows two AC power meters monitoring phase A and phase B of the 50 amp input to the RV, and the DC meter this review is about monitoring the DC voltage out of the convertor when plugged in or the battery voltage when unplugged. The only minor issue I have with them is that the mounting holes are very small and close to the circuit board, necessitating careful mounting of the board to avoid shorting anything out. The cost is reasonable.

Stephen Ibarra

| Oct 11, 2021

All were tested by an electronic technician as soon as they arrived. The DC power supply was fine-tuned, and the HP34401A bench meter was used to ensure that all five were within. The nominal voltage is 1 volt. That shouldn't be necessary, despite the fact that they're adjustable. br>After reading some reviews about missing digits, I tested all five and discovered that one of them was also defective/dead. The seller was quick to respond and resolved the issue at no additional cost to me. Checking 100% though as soon as you receive them is recommended. They're ideal for anything that needs to be kept track of.

Cash Gross

| Oct 03, 2021

This is being used to show the voltage in a 7-cell 18650 battery pack. Set the voltage from a 12 volt battery to 13, according to the multimeter. 44 volts, 13 volts on the meter I put it on 4v and plugged it into a 7s battery pack, and it read 29. DMM said the voltage was correct at 7 volts. I was a little concerned because these meters have a maximum voltage of 30 volts, and the battery pack I have is only 29 volts. I have 7 fully charged batteries, and they work perfectly; I will update this review if anything changes. However, the price and free shipping for five of these are unbeatable. A $2/piece meter will not keep me awake at night.

Ruby Hoffman

| Jan 21, 2021