PH testers What brand of ph tester should I buy & do you have to calibrate every time you use it?

I used this one for a few years https://amzn.to/34kj6JU

Now I use this one: https://amzn.to/3hhtFRG You don't need to calibrate every time. Once every 2 weeks or even once a month should be fine. ALWAYS keep it in storage solution or else the probe will go bad within a year :(