Multimeters
AstroAI AM33D Digital Multimeter
The AstroAI AM33D is the very cheap meter that shows up in every toolbox, and for the basic e-bike checks it is fine: DC volts at the battery port and charger plug, continuity on a brake sensor, resistance on a throttle. It is manual ranging with a small display and plastic build, and you should not trust the accuracy to the decimal. If all you want is to know whether a 48 V pack is reading near 54 V fully charged or down near 40 V, it answers that. Owners who end up doing more electrical work will upgrade, but as a first meter it costs less than a lunch.
Best for: First multimeter · Occasional voltage checks · Keeping a spare in the garage
View details & where to buy
Sold on Amazon