Top display you might pick up for tech trial (4,4)
I believe the answer is:
beta test
'trial' is the definition.
(I know that beta test is a type of trial)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for beta test that I've seen before include "trial in late stages of development" , "product trial" , "Final stage of software trial" .)