What is Reddit's opinion of Apera Instruments SX811-SS Portable pH Meter for Food and Dairy Products, Equipped with Swiss LanSen Food-Grade Stainless Steel Spear Probe, Anti-Contamination?

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I just looked for the newer edition and found it. This is the 4th edition and no longer has the vol1 and vol2. I bought this pH meter : https://www.amazon.com/Apera-Instruments-Food-Grade-Stainless-Anti-Contamination/dp/B01F34Y7XS/ref=mp_s_a_1_8?dchild=1&keywords=apera+sx811&qid=1596546058&sprefix=Apera+sx811&sr=8-8 And I am still married so far....

What I am planning to do is getting a yoghurt pH meter, and checking if the pH of the yoghurt correlates with my ability to tolerate it without an urgent bowel movement soon after, and what is the cut-off. Because anything sour gives me a similar reaction, even a fruit. The thing is the level of sourness in yoghurt which triggers it is so small, that its hard to tell until eating a significant amount of it, and then its too late. So I am thinking a pH meter would help, there are ones made especially for yoghurt, because it needs a special probe, eg: https://www.amazon.com/Apera-Instruments-Food-Grade-Stainless-Anti-Contamination/dp/B01F34Y7XS/