digital ph tester?

It's the degree of accuracy when properly calibrated, not a measurement against kits or strips.

I guess what I am really asking is can I use a digital ph tester instead of liquid drops

Sure why not, if you have the money. You'll need to calibrate it every so often.

ebay has one that is aroound 10$ (I dont trust it)
but there is also one around 20$ thats made for pools, to test ph and chlorine
I figure the second one could be really useful during water changes to make sure no chlorine and that I have the right ph because I use IAL

I dont think I can link ebay on here but I can copy paste the description for more infor if needed

its called "Home Swimming Pool Water pH / CL2 Tester"
you think its worth it?

It's cheap for a reason. Read the reviews on amazon.

Honestly you'll use it a few times and it'll sit in the back of a drawer somewhere.

figured it was too cheap to be true
thanks