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 Nancy Ruesink

I have used (1) Sonkir Soil pH Meter, MS02 Soil Moisture/Light/pH Tester 3-in-1 Plant Garden -Tool kits maintenance ideal for garden, lawn, farm, indoor and outdoor, pH measurement function and (2) Atree soil pH meter, 3-in-1 soil tester kits with moisture, light and pH - Garden, farm, lawn, home and outdoor test (no battery required) for pH measurements to see if they were accurate. 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 pH 7.5 at 1" soil depth and 6.9 at full probe depth, (2) showed pH 7.5 at 1" probe depth and 6.9 pH at full probe depth and (3 ) measured 4.96 pH for the entire probe. 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 meters (1) and (2) for measuring pH and a limited meter life (3) is to use (3) to make precise mixtures of water and white vinegar , to obtain the desired 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.