I wrote this guide/review on choosing the quality battery tester for people that are new to the battery world. I covered ZTS testers as the best overall and explained why. : r/batteries
ZTS MBT-LA2 Lead Acid Multi-Battery Tester MBT-LA2 B&H Photo
ZTS MBT-MIL Multi-Battery Tester™ (MBT-MIL)
SDI CELL03 Cell Pulse Battery Tester with Plier Type Leads | InspectUSA.com
ZTS Battery Tester | Mini Multi-Battery Tester | Trailcampro
ZTS MBT-1 Multi Battery Tester MBT-1 B&H Photo Video