When measuring a used 50v 33uf electrolytic capacitor that was removed from a circuit, why would this meter only display a capacitance reading and no ESR reading? I'm doing a recap project and it only showed capacitance on all three of the caps. It didn't show an esr reading at all. I measured several NEW caps I have that are close to those used caps in size/capacitance and the meter DID show ESR readings on those caps. Any ideas? Thanks!