Review on 🚗 KONNWEI KW600 Car Battery Tester: Professional 12V Load Analyzer, Alternator Tester, and Voltage Test for Automotive Batteries by Nick Walsh

I tested this gauge on 2 cars and 4 standard cast iron batteries. Seems to be 1% accurate compared to my Fluke and O'scope gauge. Mine shows a constant low level of 0.05-0.07 volts which is good and quite amazing given the price. The reported ripple matches my oscilloscopes, but there is no voltage grid in the ripple waveform display on this unit. My oscilloscope shows a higher spike which could be the ECM control knob which doesn't show up on this unit but since I don't have a really bad oscillator I can't compare what a bad waveform looks like. The only thing I don't care about is that you can't record the oscillator's ripple waveform. The waveform selector records only on the 3 to 15 V scale, so any ripple in the 50 to 200 mV range is invisible. It would be nice to have a choice for the 1 or 2 volt AC range as displayed during the alternator test. The ability to store this waveform for later comparison allows early detection of diode attenuation. That might be overkill for a $50 knife, but since the display is in one test, why not keep it in another. The instructions may be a bit clearer for those unfamiliar with this type of meter and it is possible for a bad battery reading to show up on a good battery if the small prongs on one side of the terminals are not making good contact. These little pins are where the wires connect and since we are trying to measure thousands of ohms these pins need to make good contact. Another thing worth noting is that for a good ripple reading, the red (positive) wire must be connected to the alternator output, not the battery. Resistance in the wire and connections between the alternator and battery can weaken the reading, but for the sake of simplicity the battery will work unless you get an abnormal reading and want to investigate further. Aside from those few things that can be fixed with more information in the manual and possibly a software update, I think this is a very valuable tool and I would recommend it to anyone interested in having their car or mechanic checked . And don't forget to take this with you the next time you buy a battery, it can prevent you from getting stuck on something that's been on the shelf for months and has already started to sulfate. Edit: I think I should edit this review. The day after writing the first review, the meter stopped working properly. I sent it back for an exchange and got a new one. After further testing I found that the ripple test shows 1/2 of the total. I don't know if it just shows the ripple above or below the baseline but doesn't show a peak. I've also noticed that the print function doesn't work properly. Although I can play back the recorded waveform when I try to download it to my computer it only prints the last 2 or 3 seconds. The waveform is actually loaded and the sample rate has to be very low as the rounded peaks have a flat top which makes it impossible to read the peaks. I have emailed the company several times and they reply but do not seem to understand and only quote the management. It might just be a language barrier, but it's frustrating. I hate to turn down but I'm not sure about durability at the moment and it doesn't deliver on all of its promises. For this reason I hesitate to recommend a purchase.