This thing It works fine though every once in awhile you have to re-calibrate it. It's my second one. The first stopped working after about a year and a half, but I didn't take very good care of it and the thing got all kinds of water over it. But for $12 I don't really care if I have to buy a new every year or two.
I love my digital. I just got it a couple of weeks ago after using strips for a couple of months. amazon Ph meter
Digital PH Meter PH Tester 0.01 PH High Accuracy Water Quality Tester with ATC for Household Drinking Water, Swimming Pools, Aquariums, Hydroponics (Yellow) https://www.amazon.com/dp/B07HD5P7WC/ref=cm_sw_r_cp_api_i_RKMhFbDK7P56H