KZYEE KS20 Heavy Duty Truck 24V 12V Car Battery Circuit Tester, 100-2000 CCA,Automotive Battery Load Tester, Auto Cranking Charging System Digital Battery Circuit Analyzer for Vehicle Truck Motorcycle

Easy to read and accurate

Worked only once then dead and only 30 day return policy. $128.00 for 1 use and I’m out the money, refund or replacement would be nice, I’ll send the other one back.

So this product is kind of interesting, It's not a load tester but an equivalent series resistance meter, it claims to inject a small AC signal at a specific frequency to gauge the battery's internal resistance (impedance actually, given the signal is AC). It then uses a look-up table to judge the health result for a battery's claimed CCA (provided by the user). The manual claims their test conforms to a standard used in modern car battery specification to make this judgment.I tested this on an old 580 CCA battery I keep charged with a float charger in my garage (made around 2008). This was a very high-quality japanese-made JIS standard battery from my car when I bought it new, I retired it about 8 years after I bought the car because I felt cranks were getting a little weak and did a swap out. But the battery wasn't dead at that time so I wanted to use it for DC experiments and such. That swap was about 3 years ago.Well, I have been noticing in the last year that the battery has been building up the usual white powered compound on one of the terminals. This was interesting because I've been lead to believe this is sign of overcharging, which is caused when a car battery resistance climbs so high that it becomes a parasitic load during charging, and charging never actually stops. The battery keeps accepting a charge and using it to produce heat...which in turn causes electrolyte to vent out into the air around the battery and build up on the positive terminal.Well the meter started right up and at first the entire display in a non-english, asian, language, I was told this could happen on other reviews, so I whipped out my phone and used a major search engine visual translation app. The phone camera looked at the display of the device and translated the items into basic ideas...one said something like "current values", I took that to mean settings! It's the second option of the three (option in the middle of the screen),I used the arrow keys to highlight it, pressed the enter button, and then I saw the word "English", used the arrow buttons to highlight it and pressed Enter again...suddenly everything changed to English. Great, language set.Now it was time to test out the battery, I selected test battery, it came back after about 1-2 seconds and said....damaged (which means repair according to the manual). It claimed the 580 CCA battery had 170 CCA left, was 15.3 milliOhms, and ~8% of it's capacity left. Well..that would explain the sulfation.It based that opinion on the resistance being so high. I think it's barely supposed to be like 3 milliOhms. I'll next try this on a vehicle I don't care about, then I'll try it on my car.Just to note, the meter works between 9v-30v, so if you're battery is under 9v...It won't turn on. All in all, pretty cool. I do wish there was a 12V outlet interface to do this from inside a car, but that may add resistance to the reading, so I can see where that wouldn't be something that's encouraged.My usage of this meter will really be tracking the readings over time on our vehicles. So this would be great to scan your battery monthly or quarterly. Then you'll be able to see the drop over time and get ample notice that you need to plan for a new car battery well before your first "weak crank". You can also get caught off guard in the winter as cold very much affects the battery. If you get a weak battery over a cold winter...you could suddenly end up with a no-crank situation instead of a weak crank. That's much less likely in warm, summer, weather.Overall, assuming it's accurate, I'm glad I have it in my tool chest. Another data point to perform on my car at maintenance intervals for tracking (similar to fuel mileage tracking).Lastly, I'm unsure this is a KS20Pro. While it looks like the picture on Amazon...the name on the unit just says KS20. "Pro" isn't mentioned anyway. Possibly a labelling issue? Either Way, I'm glad I have it..hopefully it functions for years to come.

At $100, this is about middle of the road for testers like this and the lower end can be almost half of that. Another thing to point out is the basic monochrome text interface, which some cheaper models offer a more graphic version instead. Naturally, the low resolution is functional albeit not necessarily pretty.Starting up, and the first hurdle of the device I am testing is that the interface is presented in Chinese. Three options and seemingly no easy way to change the language. Well, it's the second entry that allows to select English as the only other language. The third item is to change the display contrast and it's not even shown in the manual. (I cheated and used a visual translator) to guess what the Chinese symbols meant.)Once in a for me more collaborative language, the display and user interface is straight forward. The battery test is then divided into the four main functions, and the result is strictly reported as measurements. It's up to the user to draw the right conclusions of the battery and charging system condition.The manual contains a large selection of battery code equivalents, and that turns out to be necessary since for the main test you have to manually enter the battery type. This feels like there is a bit too much responsibility delegated to the user, although experts are able to adjust to their liking.There is only minimal user guidance displayed and I mentioned already that the results are only reported and not judged in any way. That makes this less of a tool for occasional users and especially less useful for less inclined users that don't want to become battery experts.The absence of any graphs (i.e., the drop in voltage for the crank test) in addition to the mentioned minimalist interface and reporting make it difficult to justify the price tag, although i have no good way to judge accuracy.

Product works great. Have used many times. Very accurate and great tool for the price. Comes with a great carrying case.

This unit will not power on there's no screen