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

" br>br>For starters, there is NO "DOCUMENTATION" with them! Here's everything you need to know now that you've typed that.
1. They can withstand a maximum of 30 VDC.
2. They will not read input voltages that are "negative"!
3. The RED wire represents the DC supply voltage (3-volt). 30 volts direct current)br>br>br>br>br>br> COMMON RETURNbr>5 is represented by the BLACK wire. The MEASUREMENT wire (0-1) is WHITE in color. 30 VDC input)br>br>Connect the RED AND WHITE wires to the "supply," and the BLACK wire to the "ground/return. " If the voltage is higher than 3 VDC (MAXIMUM 30 VDC! ), ), the meter will "self-calibrate. " "Keep an eye on the DC voltage. " If the RED and BLACK wires are connected to different sources (i. e. , 9V battery), use the WHITE wire as a "voltage probe" (0-100 volts). NO "negative" polarity is allowed on the 30 VDC input! As with a DMM, the BLACK wire serves as the "ground reference. " There will be three options for you. If your readings are within a digit of accuracy, the units will "auto-calibrate. " range", with the decimal point moved to the appropriate place. Finally, I strongly advise you to "calibrate" these units with a Precision Voltage Reference (i. e. , a voltage divider). KKMoon, KKMoon, KKMoon, KKMoon, KKMoo Take a look at my review of it! Connect the Voltage Reference between the WHITE and BLACK wires and power the module with a 9V battery (RED and BLACK wires). Most likely, you'll need to ADJUST the unit using the VERY SMALL potentiometer on the back (a 2mm blade screwdriver will suffice) - BE PATIENT, as a minor "tweak" can dramatically alter the appearance! br>br>Once the units have been "calibrated," they can be easily integrated into "low-power" systems. As monitors, use "high voltage" circuits. IN CASE YOU MISSED IT, HERE'S THE DETAILS: BLUE 7 is a group of seven people who have come together to create a THESE SEGMENT DISPLAYS ARE EXTREMELY BRILLIANT - It's possible that you'll need some blue-tinted glasses. They were given tinted plexiglas to use as "display windows. " I'm not sure how vibrant the other colors available are.

Anahi Ryan

| Jun 19, 2021

Pros: It has a nice look to it, with a 7-segment LED display that is sharp and easy to read. There are only three wires, so it's very simple to use. br>br>Contrary to popular belief, there are a number of disadvantages to using this product. Only 120kOhm is used as the input impedance. As a result, it will drain a significant amount of current from your load. With this device, you won't be able to monitor high-impedance signals. As a result, you won't be able to connect it to most types of sensors directly. An amplifier is required to buffer the sensor output. They could have at least buffered the inputs with an op amp, which would have cost only 3 cents more. br>br>Another disadvantage is that the input is not protected at all. During the testing, I fried one of them. When I was changing the settings on my multimeter, the display suddenly went out. As a result, they are easily damaged due to a lack of circuit protection. br>br>For a total of $2, this is a great deal. It's not bad at all, 50 cents per person.

Adele Holder

| Jun 11, 2021

The blue color is the easiest to see from across the room, while the green appears dull and difficult to see from afar (though I am also red/green colorblind). By connecting the voltmeter's leads with some male Dupont tips, you can make the world's tiniest Volt meter for testing circuits on a breadboard.

Jayceon Cross

| Mar 27, 2021

  I really like these displays; they do a good job for the price. I do a lot of cell research, and I like to know what the voltage is all the time. br>br>Note: If you need to measure low voltages, say less than 3 volts, you'll need an external power supply or a battery to power each display. This is understandable because you won't see any data if you use these displays to test a dead (zero volt) battery. They function properly at voltages greater than 3 volts. br>br>It's worth noting that one of the packs had to be calibrated. I used my digital multimeter to compare the readings and found that they were slightly lower than the real thing. The rest were fine. br>br>In my opinion, these displays are excellent, and I will most likely purchase more in the future.

Amy Beck

| Jul 06, 2021

The product is simple to set up and operate for the first two hours. Two of these digital readouts smoked and then quit after turning the connected equipment off and on for the third or fourth time (I only run the monitored equipment during the daytime hours). I ordered five, and two of them have already stopped working after being connected to a 12v DC charger. br>br>Follow up: They've all gone out now. During use, the voltage reached a maximum of 13. 2v dc. After the third or fourth turn on, all five of them turned off, with a couple of them lasting only five minutes or less.

Luciano Blair

| Jun 11, 2021

Bayite contacted me to see how I liked them, and I informed them that seven of them were way off the mark. That's when they mentioned the (extremely small) set screw on the back, and I was able to adjust the voltage while they were connected! They have a lot of color and are very clear. Bayite, thank you!.

Isaias REES

| Dec 06, 2021

I bought five paks, even though I only need one for the time being. I'm developing a fuel for automobiles. Tester for temperature gauges br>I wired it up according to the diagram on Amazon. It was successful! The figures are bright and appealing. I used a voltmeter to check for accuracy. The precision appears to be acceptable - For what I require, it's close enough. I'm not sure if the other four work as well, but I'm pleased with them and would buy them again if necessary.

Khalani Lester

| Jan 23, 2021

Be gentle with the wires and connections because they are fragile. I've set it up to read at a close distance from me. All five of them read the same from zero to just over 5 volts. That suggests they're quite good! The light is bright (adjustable) and responds quickly. I've purchased several of these sets. br>Warning: The following information is for informational purposes only. The wires are extremely small and delicate, making them nearly impossible to strip, and they're attached to a similarly-sized board with a tiny amount of solder. Be careful with these microscopic wire ends! (Yes, I've successfully reattached wires, but trust me when I say you don't want to!) You'll be fine if you're careful and don't put any strain on the connections.

Brooke Maddox

| Jun 16, 2021