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Oh my goodness, that Solar unit is the same as one I used to have! Such memories it evokes! With a 6E5 electron ray indicator and a 1-v rectifier, I got years of use out of it.
Right now I have two instruments, both General Radio bridges, that measure capacitance at low frequencies. One also measures ESR. If I need a high frequency measurement I cobble up a circuit with an RF generator and an oscilloscope.
I had a Hickok VTVM with a capacitance function but that didn't actually measure capacitance; it measured voltage drop at 60 Hz, which is only valid for low loss capacitors.
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