Works as it should and easy to follow directions. Great price, too.

Very easy to use. I checked both my alternator and battery. Good product for your money!

When I bought this device I was expecting it would have some kind of diagnostic capability to assess the battery and the alternator. It doesn't.There are 3 positions: 24v, alternator, and 12v. But these positions don't do anything more than simply shift the scale on LED readings. In fact, the alternator position isn't really useful... because you get the same reading for the battery when the engine is running--it's showing the charge received from the alternator.The panel shows a series of LED's to let you know the "analysis" of the battery health. But there is no complex diagnosis happening. Based on the voltage detected, a corresponding LED will light up for the predetermined range of what is established for Full, Medium, Low, and Empty. You could simply refer to a static chart for battery voltages:12.7 = 100%12.5 = 90%--------------- ^ Excellent12.4 = 80%12.3 = 70%12.2 = 60%--------------- ^ Good12.05 = 50%11.9 = 40%--------------- ^ Low to Fair11.8 = 30%11.6 = 20%--------------- ^ VERY low (may not start)11.4 = 15%11.3 = 10%--------------- ^ DANGEROUSLY low (likely won't start)DEADIf you don't have a multimeter, this device is handy. The best testing is ALWAYS directly from the battery terminals. If you do it from the cigarette lighter, you will get a lower reading because of the circuitry (potentially off by as much as 0.5v).PLUS: You are given 2 connectors to test the battery. The clips are the best way. However, one nice touch is the coupler used. This is compatible with some adapters that are used with car chargers such as ADPOW. I use an ADPOW charger for my battery periodically (since I don't drive a lot) and installed the adapter for a quick, easy, and safe way to connect the charger. This AUTDER tester uses the same plug, so I don't need to mess with the clips.My multimeter is a Fluke 73. It's extremely accurate. This tester runs a little low in comparison, by 0.05 to 0.1v. I don't know if the maker does any kind of calibration... so maybe other units could show different deviations. I would, as a measure for peace of mind, compare your tester to a professional multimeter to be sure it's within an acceptable range. I'm not happy my AUTDER tester doesn't match 100%, but it's close enough and at least underreporting.CONS:For the price, I guess it's not a bad deal but the word "analyzer" is rather misleading. This is a tester. It doesn't do any notable diagnosis that you couldn't determine yourself by looking at a voltage chart. The clips for attaching to a battery terminal are rather cheap, thin, easily bent, and the insulator sleeves are not well secured. The directions do not warn of lower than actual voltage readings from the cigarette lighter. Also my example showed a slightly lower than actual reading compared to a multimeter. There is no included storage case.PROS:For those people completely ignorant about what voltage levels equate to full, medium, low, and dead, this device is helpful. It's good that there's 2 ways to test this--battery terminals or cigarette lighter (but beware the latter will show as lower than actual). It's also great that a standard connector is used instead of proprietary, so if you've got a wired adapter already connected to your battery you can use this tester directly. The LEDs are reasonably bright. Also, the unit is not very heavy.

Works very well and small size makes it handy to use

Everything works well and easy to use to Jumpstart you car.

Great price and does what it says. Being able to plug it into your car lighter/socket makes this sooo easy. Gives you battery voltage and alternator status immediately.

Simple operation. It lets you know about battery and alternator conditions I like the connector to cigarette lighter. What I do not like is printed letters by the led indicator are a bit small to read due to my vision. Can’t complain mush about it for the price I paid for though.

En las imágenes pueden ver que probé el alternador desde dentro del vehículo y también probé la batería. Me ayudó a notar que mi batería estaba en mala condición como se ve en la imagen. Buen producto, sencillo, pero resuelve.

awesome product.....worked great thanx !!!!!

Sehr guter Batterietester der seinen Zweck erfüllt und das zu einem recht günstigen Preis!!

Recibido ráìdo, puede conectarse sirectamente al mechero y llevarlo siempre colocado para ver las subidas y bajadas de la bateria. Lle dos pinzas acopladas para rasyres bateria. Me gusta

Fait un peu plastique mais fonctionne très bien

Fonctionne bien et possibilités par pinces ou par allume-cigare.Un peu léger pour le long termeAffichage agréable