When testing electrolytic caps, be sure to do so soon after discharging.
They can recover a fair amount of voltage (depending on how high their voltage was prior to discharge) over time.
Oh yeah
great heads up, sometimes they kick back to jolt life,
either reform/recover by themselves or perhaps borrow electrons from elsewhere whilst operator discharges and desolders component legs to isolate and test suspect capacitors
Be on top of it ALWAYS, otherwise you'll out pocket for a new ESR meter,
and maybe more cash blown if you haven't got eyewear on during an 'up close and personal' nasty metal on metal cap spark
I double check the high voltage suckers are flat with an analogue multimeter set to the highest voltage range 750>1000v,
if there's serious life I drain them with a resistor again or keep the resistor on there till I'm ready to work on it