Jac has a really nice page about tube testers. https://jacmusic.com/Tube-testers/
After reading this and lots of research i've settled on a combination of Eico 666 and utracer, both are (were) kit products.
The utracer is a very good quality kit that i can highly recommend.
Their digital testers comparison site seems offline. But i've found this: https://jacmusic.com/Tube-testers/Digital-Testers-Compare/FRAMES/COMPARE-MAIN.htm
