It worked as expected.-

I've been using these meters in a research lab setting. Repeatable milliohm measurements via 4 point AC technique to measure contact resistance and material conductivity. Seems to work almost as well as meters costing 20x the cost. (The AC resistance probe method reduces thermocouple junction effects at the probe contacts which mess up usual DC resistance measurements.) Amazing precision instrument given the very low cost. Works great for internal resistance measurement of battery packs but great for many other applications. Main issue is the probe wiring is fragile. Overall the YR1035+ is highly recommended.

Works great for testing batteries. Def worth considering if you are looking to repurpose Li ion batteries.

It's not a fluke. But it didn't cost very much. These meters are a good way to test batteries including power lead connections and cables.

Nice tool to check the health of cells. Seems accurate and repeatable.

Although the unit is not impressive to look at, it works surprisingly well. I tested many batteries ranging from 18650's (new and old), lead-acid, NiMH, NiCad and LiFePO4 with meaningful and repeatable results. I bought the package with the battery test jig and it is a worthwhile accessory. Overall, it's a useful device, particularly for evaluating used/recovered batteries, and represents a good value. Time will tell how it holds up. The test leads and Kelvin clips use small gauge wire, and don't instill confidence, so go easy with them.

Unlike voltage-drop measurements, this 4-wire meter is accurate, the readings are stable and repeatable, and the state of battery charge does not seem to skew the IR (internal resistance) results. If you have the need to know how much useful life remains inside your batteries before they are worn out, measuring IR is the way to find out. I label new batteries with the date and IR in milliohms to serve as a baseline for future testing.I use this meter with individual rechargeable NiMH, Lithium and Lead-Acid batteries. You can also take readings of batteries inside a pack if the battery management circuitry of the pack permits. Obviously measuring individual cells is much more useful in understanding the health of an individual battery. Once you have a benchmark resistance measured for any specific type and size of battery, it is easy to track the deterioration of the battery over its life. When resistance becomes very high, there’s no point in continuing to use a worn-out battery. It simply will not have a long runtime even if it shows full voltage and tests “good” on a standard battery tester.When using this meter, the probes must make very firm contact with the battery terminals to eliminate resistance caused by poor contact. The needle-point tips on the standard probes and battery holder probes are spring-loaded to enhance contact. The clamp probes have strong springs also. If your reading is fluctuating you most likely have not made good contact of the probes to the battery. You can use the meter in auto-range or you can set a range. Auto-range works fine for me. The meter reads out on its backlit LCD display the DC voltage and IR (internal resistance) in milliohms (auto switches to ohms as needed).My meter arrived with the menu in English, but the language can be set to either English or Chinese. In the menu you can adjust the backlight and adjust the auto-off time. The meter has several features that I don’t use including Sorting Mode and Grading Set. You can set a resistance range to quickly test a bunch of batteries for pass-fail that might be handy for some people. The menu has a RS232 serial setting. There “might” be computer software (not included) that can be used with this meter, but I cannot comment if that feature is available or not.I suggest getting the kit with all of the probes (standard probe, clamp probe and battery holder probe). Using the standard and clamp probes is self-explanatory, but it took me a bit to figure out the battery holder probe. I knew the needle-point tips in the battery holder were spring-retractable, but I did not realize the entire negative terminal is also spring-loaded. The procedure is to adjust the positive terminal to a position ¼-inch less than the length of your battery. Then load the battery by pressing the negative end of the battery against the spring-loaded negative terminal to retract it over ¼-inch until the battery fits inside the holder. Let the spring tension press the battery firmly against the positive terminal and the meter reading will appear instantly. It takes only one or two seconds to load a battery once the holder is adjusted to length. That allows you to quickly test multiple batteries of the same size.The meter runs on an internal rechargeable 2,500 mAH lithium battery for long runtime between charges. To charge the built-in battery, use your own Micro USB cable connected to your own USB charger or power supply or computer. The LCD display shows the state of battery charge. This Yaorea 1035+ battery internal resistance meter appears to be a well-made high quality instrument with a single purpose to evaluate the condition of individual batteries by measuring internal resistance and voltage.

I specifically purchased this meter so I could measure the internal resistance of some high-current LiFePO4 cells. I wanted to be confident that the cells could be well matched by internal resistance as I would be pulling as much as 30C for multiple seconds at a time. Well, this meter gave me exactly what I wanted! The measurements are fast, accurate, and most importantly repeatable! In a set of 5 tests on the same cell, the reading never seems to deviate more than 0.01-0.02 mOhm either direction! Incredible!As for my complaints about this device, they are all about the leads. I purchased the kit that only had the standard pen-style leads. The pictures of the product show each lead having its own cable all the way back to the connection into the meter. Mine, on the other hand, was one 4-wire cable that was stripped back about halfway down where there was some heat shrink and then two wires going out to each lead. It is basically what is shown on the battery holder leads found in kits F and G. These wires are pretty small and simply twisted around each other so I am a little concerned about longevity.The bigger problem I had about the leads were that they were not long enough. I could have the leads on each end of an 18650 cell, but they would not reach on anything larger with terminals on opposing ends. I had to strip back even more of the black insulation to get more length out of each lead just so I could measure my 120mm long cylindrical cells. Hopefully I just got some old stock and new orders are getting the leads shown in the listing.Either way, the product does exactly what it should and what I was looking for! I can absolutely recommend it for any hobbyist battery pack builders (power tools, uninterruptible power supply upgrades, solar, etc.).