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

Good looking blue LED display with a very small footprint. Good accuracy from 0 to 30V running off of a 5V supply. These do not measure negative voltages.

They work accurately enough to give you a point of reference. Not expensive, so not top tier. Example: Vehicle is charging at 14.4v@idle as verified on multimeter at display connection, adjust pot to calibrate this display to match meter, then turn off car to see 12.4 on meter and 12.7 on this display.... As stated, ideally used as a point of reference (you are above or below your target range). The deviation will spread as the range gets wider, but it's perfect for a voltmeter in the dash or on an amp. Just a monitoring tool, not a diagnostic tool.

They all seem a accurate, and only had to adjust one of them by 0.1V based on the reading from my Fluke meter. Bright display, easy to read. Like the Three wire set up for reading voltage of same device or separate one. Dislikes... With the lack of a bezel you need a CNC machine to cut out a accurate hole to mount them and still look nice... See picture.... The wires come out the top of the board... See other picture... So when you mount it thru the plate. You need a couple washers to space it so it rests flat. If the wires were soldered to the other side of the board, this would not be an issue. Still would recommend

Excellent product

These meters are a great deal! Definitely worth the price. BUT - Read the description carefully. 1) Measurement capability is UNIPOLAR which means you can only measure POSITIVE voltages, NO NEGATIVE input or display is possible like with a digital multimeter or bipolar input panel meter. 2) The measurement Input (White wire) places a heavy burden (load) on the voltage source being measured. Input impedance averages about 100K Ohms. So, they cannot be used to measure high impedance circuitry without a buffer. The typical load placed on the source being measured is less than 1mA, which is okay when measuring low impedance circuitry like batteries, etc. - just a caution. 3) The wire insulation is too stiff and bulky and too short. If you are a skilled solderer (with a temperature-controlled soldering station) you could carefully replace the three wire cable. 4) You really need a blue plexiglass filter in front of the digits to increase contrast of the blue LED's and to make them more easily readable in bright light. 5) Factory calibration for all 5 meters was consistent but low. They all read 14.9VDC on a 15.007VDC calibrated source. That was easily corrected with the help of my Fluke 87V Digital Multimeter. They all now read correctly and linearly from 5VDC to 29VDC. SUMMARY: These are very accurate meters for the price as long as you understand their limitations. Longevity is still an open question at this point. However, at this price, they are a GREAT value, overall.

These are great little devices. I build various size battery packs and use these to determine their state of charge. The wide voltage range of 0-30v is perfect for my application They are very easy to use. If you don't need to measure < 3v than the simple two wire connection is all you need. It doesn't get much easier than that. Even in daylight the blue display is bright and easy to read. All 5 of the voltmeters I received measure accurately and identical. Good quality. Highly recommend.

These little voltmeters work just fine. The meter has three wires: red (positive) and black (negative) to power the meter, and a white wire you connect to the point where the voltage is being measured. There is a tiny Phillips screw on the back of the meter to calibrate the reading. I found that the little voltmeter agreed with my multimeter down to a hundreth of a volt. I did not need to calibrate the meter. These are inexpensive and work well. I like them.

The screw holes are so small and with limited space as well as a weak mounting plate making mounting these very difficult. Additionally, the wires are such a small gauge (~22g) that it makes it challenging to connect to a fuse panel or other terminal. Additionally, the meter itself seems weak and vulnerable to being damaged unless in a protected enclosure.

I disliked the false advertising and different product was shipped than what is advertised. It is missing the voltage calibration screw on the back.

Los productos llegaron a tiempo y corresponden a la información, estoy muy satisfecho y lo recomiendo encarecidamente.

Fácil de conectar y usar, no estaba bien calibrado, pero es sencillo de ajustar.