0.28" LED Digital Voltmeter Ammeter, Digital Voltmeter DC 0-100V 10A with Blue & Red Dual Display, Mini 2-in-1 Volt Amp Monitor Tester, Car Current Gauge for EV Boat Electronic Circuit

well packaged and as advertised, easy to follow instructions, works great

I bought two. I was able to calibrate voltage nicely with my DMM. Current is not adjustable but both were within 100 milliamps from each other with one being nearly spot on with my DMM. I used these on a solar power converter I built and it's very nice to be able to see details of operation at a glance. For the price these are awesome 8~D

Use these to monitor 1/64 scale slot car track lane V/A having 1 for each lane. Accuracy is acceptable but not precise which I didn't expect anyway for what these are but function for the intended purpose. Problem is them not functioning properly using track power supply packs. Mystery as to why after trying several standard supplies but in standby,no racing,blink on/off constantly with steady power. Only way they function is with a supply having a oem interference coil style supply or separate battery. Tried add on coils around wire but same problem. So far,1 month or so,have worked where the other 3 wire only types failed miserably. Likely use these again for replacments.

These are easy to hook up and the readout looks good. There are tiny adjustment pots on the back for voltage and current. I haven't needed to make any adjustments so far. Can be a little tricky to install. The bezel frame is a bit narrow, so you don't want to over-cut your opening for this, better to sneak up on it than cut it too big and have a gap showing. Will be buying again, and again...

Waste of money. These meters cannot be adjusted to hold accuracy, no documentation and cheaply made. They may work for a hobbyists but not for the serious electrician.

Works perfectly , and the wiring diagram made hook up a snap.

I am building an amateur radio battery box and this meter would have been used to monitor the charge voltage and current to the battery. However, the current was off by more than 50% reading way too low per the Fluke 87 meter I used to try to calibrate it. The adjustment on the panel meter was not near enough to cover the adjustment needed. This meter is only good for reading voltage which was pretty accurate. The current reading is so bad, this is going into the e-waste bin and I will look for another one that will give me a current reading that I can actually believe and use. Update 05/25/19: The vendor sent me another meter after reading my review. The second meter was very much better than the first one. I was able to adjust the second meter to about 100mA from the actual current. The meter reads about 100mA over what the Fluke meter is showing. Once the adjustment is set to the minimum, the meter reads 100mA over the actual for all ranges from 3.00A to under 1.00A. I tried setting the current to zero with no load connected by shorting the two pins labeled I-ADJ-Z and applying power, but, it did not seem to make any difference. With no load connected, the meter reads 0.07A. If the zero adjust worked, this meter might be ok with the original shunt. For the first meter, I tried adjusting the shunt by filing a notch without success. So, I ordered some 7.5mohm resistors from Mouser (P/N: 71-WSLP25127L500FEA), cut out the shunt, and soldered a resistor in its place. The meter is now usable. I can set the current at 3.00A to match what the Fluke meter is reading. The meter is a bit non-linear and reads about 50mA too low under 1.00A. However, for my needs, it is accurate enough. So, my recommendation is that, if you get a meter that is too far off for the current reading, just purchase some 7.5mohm resistors to replace the shunt. See the pictures for details on the modification. I have upgraded my review to three stars because the second meter could not zero and the first meter was not useful until the shunt was replaced with a shunt resistor. Being an electronic engineer, it was not a problem for me. However, non-engineers might not know how to make changes to the circuit to make the meter work acceptably.

Great value. Easy instructions.

I have been using this product from past 2years not any issue with this product works perfectly also I have upgraded my system so smar product installed value for money and easy to use, install and read the readings.

fonctionne tres bien

Facile à installer bien reçu

use it to monitor 12volt batt status and current. checked against meter it seems fairly accurate

Does what its supposed to do. Using this to monitor my 48vdc power supply output to my CNC spindle. Plugging is simple.