IMHO, the 'best' capacitor meter is a scope. Since capacitors
pass AC through them, a scope should show the same wave shape, or
lack of it on each side. If it is a coupling cap then there
should be signal on each side; if it is a bypass cap, there
should be no signal on either side. There are some exceptions to
this such as wave shaping capacitors in vertical deflection
circuits but, by and large, what I have said is true. The best
part of the scope method is that the cap is checked in circuit
with no need to disconnect it.