What is Reddit's opinion of ISAIBELL Digital PH Meter Tester, 0.01 High Accuracy Quality 0-14 Measurement Range for Household Drinking, Pool and Aquarium Water PH Tester Design with ATC.?

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Same experience here. I got mine for my kombucha, and it was just a random one off Amazon, around $20. It came with some calibration solution powder as well. It's been reliable since I got it last year.

Edit: this one, more like $15. https://www.amazon.com/VANTAKOOL-Accuracy-Measurement-Household-Drinking/dp/B0789G7MVP?keywords=PH+meter&qid=1537457868&sr=8-3&ref=mp_s_a_1_3

$14 on amazon, comes with kit to calibrate the gauge. Hasn't steered me wrong

VANTAKOOL Digital PH Meter, PH Meter 0.01 PH High Accuracy Water Quality Tester 0-14 PH Measurement Range Household Drinking, Pool Aquarium Water PH Tester Design ATC (Blue) (Yellow)

https://www.amazon.com/dp/B0789G7MVP/ref=cm_sw_r_cp_apa_i_ANE1BbM20SMKG

That's the one I use also, here's a link! Comes with a calibration kit

VANTAKOOL Digital PH Meter, PH Meter 0.01 PH High Accuracy Water Quality Tester 0-14 PH Measurement Range Household Drinking, Pool Aquarium Water PH Tester Design ATC (Blue) (Yellow)

https://www.amazon.com/dp/B0789G7MVP/ref=cm_sw_r_cp_apa_i_pW81BbJWJT61Z

https://www.amazon.com/dp/B0789G7MVP?ref=yo_pop_ma_swf

I got this one, they're all pretty much the same I'd imagine https://www.amazon.com/VANTAKOOL-Accuracy-Measurement-Household-Drinking/dp/B0789G7MVP