Ph Tester, Digital or Solution? Options

[a320]

Hi Everyone,

My first post. Would like to know what is consensus on ph testers? Do most people use digital or solution?

I'm currently using a milwaukee ph test pen for my aquarium tank (no green water) but it doesn't seem to instill
confidence as i think my buffer solution is not accurate at all. What sort of calibration buffers do you all use? I'm not from singapore so a headache sourcing calibration solutions here.

I've used the Ph test kits before and thought that a test pen is better....but having my doubts now as i'm not sure of the accuracy.

Could appreciate if anyone could share their thoughts......and also if possible some test pens/ kits recommendations, where to get them from and the price.

Thanks.