I have one of those little battery powered ESR meters (best $22 I ever spent, different model then yours). Problem is most caps are in parallel in a circuit so you still have to remove them to check which ones are off. When caps leak their readings start to wander all over the place, depending on the circuit they might work or might not or worse work some of the time causing headaches. Mostly I hate them leaking and taking out traces or other close chips (same with old leaking motherboard batteries).