I find it interesting that the positive reviews, on this product, are really, really good, while the negatives are really, really bad. Any thoughts?

I think that many fewer people with good experience participate in opinions and ratings than those with bad experience. I can only say I’m happy with mine. It works as expected and is much easier to read than my previous meter. Side by side, they both read very close to the same.

Does it come with a list of plants and their watering needs??? Once I know the moisture around a plant, how do I know what that plant needs?

I've been an avid gardener for 45 years. Even though I have a vast knowledge of plant material, this question cannot be answered without knowing plants in general. You'd have to have 1000's of volumes of plants listed with requirements from all over the world, with varying climate zones.

pH is reading quite low. Is there a way to create a test mixture with known pH to check the meter?

If you read my original review, I did not even open the packaging when this product arrived, and it was because the dial did not provide for adequate accuracy in its readout. But, what you are looking for is a 'standard' against which to measure the performance of this instrument, which are available for purchase (scientific supply) -- but since you cannot really tell with confidence where on the Gain Express dial pH 6.0 falls, versus 5.8 or 6.2 or 6.4 (remember, pH is a logarithmic scale so these differences are significant), I do not see how using a standard would help establish its accuracy. The dial on the instrument that I received in fulfillment of my order was narrower, squeezed down, and -- most importantly -- without precise lines showing exactly what needle position the pH numbers on the dial refer to, and! with only whole-number pH markings there anyway (not like the dial shown in image featured here which does appear to provide more detail . . ) , so I do not know how to be of help.

Manufacturer	Gain Express Holdings Ltd.
Part number	FBA_701936211996
Item Weight	159 g
Product Dimensions	12.7 x 10.16 x 12.7 cm; 158.76 g
Is Discontinued By Manufacturer	No
Number Of Pieces	1
Mounting Type	Tabletop
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	12.7 x 10.2 x 12.7 cm

GAIN EXPRESS Soil Acidity Meter, Moisture Meter, Soil Measuring Instrument, Soil pH Meter, 11.6 inches (295 mm), Long Electrode, Japanese Instruction Manual (English Language Not Guaranteed)

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