DC 12V Car Digital Voltmeter Gauge - AIMILAR LED Display Voltage Volt Meter for Car Motorcycle (Red)

I was pleasantly surprised by the look/feel of quality in this unit. There's even a power-on animation in the LED's while it calibrates. The brightness is appropriate - I can easily see it in full daylight, but I don't think it'll be blinding at night. The sheathing of the wires is surprisingly robust, as well. Prior to purchase I had asked a question, "What is the amperage draw of this unit", and I didn't get a decent answer, so for anyone else wondering:Power draw is 40mA@13.2v, or about a half-watt. FWIW, mine's the red model, but I doubt the LED wavelength would affect current draw in any measurable way.

Added this to an aging car to confidently save nearly $1000 on unnecessary repairs. Chose this over SMAKN despite being twice the price and putting out less light and requiring twice the operating current at 35 mA. Got this for son who is driving 25+ year old car that mostly runs fine. It was running rough and mechanic tried to sell him alternator plus distributor "only $1,000 installed." But this resonated with my prior experience with this car over the years, that we were sold an alternator before to supposedly fix rough running. But the car and the alternator tester showed it the "new" one performed identically to the supposedly bad one we had. And it had absolutely positively nothing to do with fixing the problem the mechanic eventually found. So this time we self installed distributor for $66 in < 30 minutes. I put this LED meter in for < $20, in 15 minutes. We saved over $900 on repair, including over $600 avoiding unnecessary alternator replacement. Now my son can see "14.2" when he's moving, and "12.5" or thereabouts when sitting at a light. See photo where I have two digital multimeters and this device all agreeing on the voltage, with SMAKN reading about 0.1 volt lower. I told him as voltage spends most of its time in the 13.8 to 14.5 range at high idle or cruising, you're not in need of an alternator. Lower than 13.8 the battery won't keep up and you could make it up with an overnight float charge. Higher than 14.5 and you may have to add water more often. His battery is past 3 yrs warranty expired now so I set up alligator clip to disconnect it when parked. It's "only 35 mA" but hey that's nearly half a watt and may speed the day he needs to buy his next battery. So minus one star for low brightness vs high operating current. The wires were almost adequate length, and stripped and tinned but a bit short for most cases. But it worked out for my electrical-tape-and-alligator-clip installation.

Great addition to travel trailer for viewing dynamic battery voltage versus the no frills factory battery panel monitor installed in most trailers. We dry camp most of the time so I like to keep an eye on how the battery is doing throughout the day. Aside from a generator I have a 100 watt portable solar panel to charge the battery during the day. With this little gem I can make sure I’m getting the most out of the sun. When on shore power or running the generator you can verify that the converter is charging the battery as well. The display is bright enough to view during the day yet soft enough not to be annoying at night. The response time on the meter is great and accurate to my handheld volt meter. It was very easy to install tapping into the pos-neg wiring for the stereo. I hope it lasts for several camping seasons!

Recently, I had to have some work done to my 2004 Yamaha R6. I needed to have my Stator and Rectifier replaced. The person that I had doing the work recommended that I buy one of these and have him install it on my handlebars so I can monitor the voltage of my charging system as I ride. So, that's what I did.I didn't do the work myself, but I did supervise and help out as much as I could. When it came time to add this into the mix, it looked like a piece of cake, honestly. All he did was splice it into the wiring for the cluster, and then ground it onto one of the bolts that holds the fuel tank in place.It works exactly as it's supposed to, displaying the voltage that is going to my battery as the charging system works while the bike runs. The purpose here is so that I can see if the charging system fails. Should the voltage start to drop consistently, that means my battery is no longer receiving a charge from the charging system. Vice versa, if the voltage starts to spike consistently, my battery is receiving too much voltage from the charging system. Either situation would indicate that I have a problem, and would serve as a warning system of sorts so that I can have it looked at sooner.For my purposes, this is a phenomenal product.