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Came as a replacement piece, arrived in unharmed condition within the time indicated. I've set it up, it's working properly. Since there are 2 pieces, I was able to compare the measurement results with each other. The voltages are the same with little dispersion, so are the internal resistances, but the same cells have completely different capacities with the same charge. I've tried replacing the batteries in my own four containers, but there's a lot of sprains here too. charging is a short cycle, so a cyclic test (2,3,4,...) I think it's superfluous because it records the last one anyway and it's false. I also use HV-586 (1 image) which I consider to be more accurate in terms of capacity measurement. Since I originally ordered 2 so after a thorough inspection, the faulty one was also caused. It lacks 2 pieces of resistance (2-3 pictures). I consider it to be usable proportionally, mainly because of the internal resistance meter. Another advantage is that external batteries can be tested. There's still a bit of polishing to check the product quality so you don't get any unpleasant surprises, but customer service and logistics are OK.
Relatively fast delivery, packaging without problems. Tried - accuracy sufficient - very high quality product. So I can only recommend it.