I bought mine just to check how much current a motor starter needs (a friend's bike), so basically a single-use meter. The output was as expected and I was happy. Then noticed the charging current was high, while the meter was still clamped. Diagnosed a defective regulator that was feeding >15V into the battery, which is why the batteries were slowly getting killed. Strangely, a voltmeter measured fine -whenever a new battery was installed - but it slowly killed them causing the starter to spin slower and slower.
A few weeks ago had an issue with my car and noticed the battery balancing current was reading weird (it has two lead-acid batteries). This pointed to a big leak which pointed to the navigation unit not shutting down. The advanced car diagnostics did not pick up on this problem, it was just telling me "low voltage" after a few days of sitting, causing me to think that the battery went bust.
So the meter already paid for itself multiple times.