Which Tube Tester

I am looking for a tester for KT88s, EL34 & 6sn7 being relatively new to the tube circle, I am looking on ebay for a tube tester, but am unsure which one to bid on.

I am only really interested in these three types of tubes for now the testers seem to go for $10-$300. I will not be spending the $300 but if there is a brand and model number someone would suggest I would be grateful.

Thanks
(Ozzy Sorry if this the wrong forum again)