a little injector help please

Iam finding deals on used injectors on ebay. for both cobra 39s and bosh 42s if i actually bought these how do i go about checking if the actually work? can i take them to a shop? I just want to make sure the work before I install them for the obviouse reasons. thanks.
 
ok i am bringing this back since nobody replied to it. i too need to know if i can use the terminator 39 lb. injectors with the adaptors without troubles on a 2000 2v. going to be putting 9 psi down and need to know asap.