Review on ALLOSUN Battery Internal Resistance Meter/Voltage Tester/ Digital Battery Analyzer CECOMINOD062345 by Jeff Aulia

Although others claim poor performance, mine worked great. Think if you measure with a rope, mark with chalk, cut with an axe, and check the results with micrometers, you're going to be disappointed. Some shaking but calms down enough to be useful. Don't expect results of 0.00001%. I think it's great for the price and my use to get more information to customize 18650 cells for battery bank customization.