A good multimeter with all necessary functions. Two minor drawbacks, both related to response time: Firstly, the continuity tester has a short delay (0.25-0.50s) before it beeps - this can be annoying when trying to analyze a device with a lot of cables, or when it is difficult to maintain contact for a long time, leading to many false negatives. The other is that autoranging takes forever to scale down low voltage/current/resistance cables, on the order of two seconds in most cases. These aren't critical points, but it's certainly a benchmark for hobbyists/enthusiasts like me who can afford to wait and/or retest in the situations described.
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