Yes, a multimeter that can read a.c. current and voltage.
If you have one that can - down to at least the rated output of your current transformer, you can use that. If you have a “proper” c.t. that outputs (say) 50 mA like our SCT-013-000, connect the multimeter directly to the c.t. secondary winding and measure the current. You should know, at least approximately, the primary current, so you can calculate what you should be reading, and compare it with what you do read.
If your c.t. has an internal burden, it’s a “voltage output” type, then do the same but you measure voltage instead of current.
If you can’t easily get the full rated current of your c.t., remember that you can multiply the primary current by passing the wire many times through the c.t. This is how I can test the 100 A c.t using just 5 A and 20 turns through the c.t.
Your earlier question Which audio jack to use for reading the values from the CT sensor makes me think you don’t have any sort of test instrument at all. If you are serious about learning about things electrical and electronic, you really need a good test meter. With one, you could have answered that question yourself within seconds. Years ago, I wrote about multimeters in the ‘Learn’ section: Learn | OpenEnergyMonitor This is nearly 10 years out of date now, many of those listed are probably no longer available, but the ones listed - or more exactly, their capabilities and the measuring ranges - should give you a good guide for what I think you will need for general experimentation. The warning I’d add is, don’t waste money on a very cheap meter. It won’t do many of the things you will find you need to do with it.