The tester Tubs showed is good for measuring capacitance (uFd), and if that is right, chances are good it will work, but it does not put a big voltage on them looking for leakage or breakdown. There aren’t many options for testing that do that. I use an old Heathkit capacitor checker that can put up to 600 volts on them. Works great!, but Heathkit is long gone and when they show up for sale, they aren’t cheap! With electronics being a hobby of mine as a kid that developed into a lifelong career, I bought mine new in the early 1960s and put the kit together. It is an electronics lab instrument. There are some on E-Bay right now, but I was really surprised at the prices. The kit I bought in the 1960s cost me $29. Link and photo below. I have a model IT-11 which is same as the IT-28 except for color.
Dave
