It's small but answers the important questions when diagnosing a problem.
Is there power there?
Is it sending a signal?
Not having to dig out my Fluke, but just pop this on the circuit and look at my phone. Answers the questions and I move on.
Perfect.
Hook test leads too small almost useless, app needs improvements like AC and HD measure at the same time and if posible wave form. Oscilloscope needs to self adjust, data logger need to show max min, and values. I still it's a great idea but needs some work