Review on Battery Monitor BM2 BM3 Bluetooth 4.0 Wireless Battery Tester for 12V Automotive Battery Load Testing, 🔋 Monitoring Automotive Charging Systems, and Cranking Analysis. A Digital Battery Analyzer Applicable for Android & IOS Devices by Tony Miller

I have several of these for my farming equipment and don't need to go near anything totem. Allocations are nominal and do not interfere. One of these sat on my D8T for a year with no starting or starting problems. Some complain about the tiny difference in voltage, that tiny difference in voltage is nothing when they save me an hour of my time knowing I'm going to a good battery or a bad charging system. Well, if someone can save me an hour, the price of it saves me time, and time saves me money. They are NOT waterproof. I take liquid tape and cover them completely, after that you don't have to worry. I will buy more for other devices, I just want the price to be lower.