Review on FOMOOUR pH Meter - High Accuracy Water Quality Tester - 0.01 pH Measurement Range - Ideal for Water, Brewing, Food, Soil, Sauce, and Laboratory Testing - Includes TDS Meter and pH Pen by Ricky Bedell

I Used (1) Sonkir Soil pH Meter MS02 Soil Moisture/Light/PH Tester 3 in 1 Garden Plant Care Kits ideal for garden, lawn, farm -, Home & Outdoor pH Measurement Functions & (2) Atree Soil pH Meters 3-in-1 Soil Test Kits Moisture, Light & pH Test for Garden Farm Lawn , indoors and outdoors (no battery required) for pH measurement. determine if they were correct. I have (1), (2) and (3) PentaBeauty PH meter, PH meter 0.01 PH high precision water quality tester with measuring range 0-14 PH, TDS meter for water/brew/food/soil/sauce/ compared in the laboratory. Measurement using (1) showed a pH of 7.5 at 1" soil depth and 6.9 at full probe depth, (2) showed a pH of 7.5 at 1" probe depth and 6, 9 pH at full well depth and (3) measured 4.96 pH for the entire well. my attempt to bring a mixture of water and white vinegar to pH 5.0. I do not recommend (1) or (2) for pH measurement, but wetter and brighter readings are acceptable. (3) came with measurement solutions. (3) is reproducible and very accurate. The only problem with (3) is that its lifespan can range from a month to a year as its electrodes have a finite lifespan and this lifespan is highly dependent on the type and severity of maintenance. Due to the price difference and reasonable use (3), purchase (3) only makes sense for pH measurement. My workaround for not trusting bad pH meters (1) and (2) and a limited meter life (3) is to use (3) to make exact mixtures of water and white vinegar to get the desired pH To obtain pH for watering various berry bushes. So as long as I use (3) for limited use I can get very accurate results without using too much (3) which has a limited lifespan.