Question 1

I have purchased 2 of these, why are they so inaccurate?

Accepted Answer

If you calibrate ANY PH meter using the mix it yourself "calibration" solutions, accuracy will be impossible. I just purchased this meter set, and discovered the distilled water I use was ph4 and below! I have the "other" style cheap meter, that has proven very stable for me, and after checking it in GHP 7.0 calibration solution, used it to test the accuracy of this relentlessly poor example of a ph testing system. 
First off, the solution instructions make no mention what the ph of the distilled water needs to be. My 4.0 water mixed with the 4.0 and 6.86 powder, resulted in a solution of 3.3 and 6.0 instead, so IMO, the MIY calibration solutions are a joke, as are ph meters that calibrate on the 6.86 standard instead of 7.0.

Question 2

If i use a 7.0 calibration solution will the automatic calibration be off by .14 since it comes with a 6.86 calibratind powder?

Accepted Answer

Yes! I recently calibrated with 7.0. Prior to calibration, it read the 7.0 solution at 7.0, calibrated with 7.0 solution it now reads 7.18. Find the correct calibration solution

Question 3

If my tap water is between 6.5 and 7.0 ph do i need to add the ph up and down liquid i bought for indoor cannabis grow? What about ppm?

Accepted Answer

If you’re growing in soil 6.5 is perfect if you’re growing in Hydro/water do you want to be around 5.8 say you’re at 7.0 PH I would just add a couple drops per gallonTo get it down two around 6.5

Question 4

If I choose EC, does it retain the setting after power cycles?

Accepted Answer

Yes, but my meter randomly switched back to TDS.  The "EC" does not show a decimal, and the numbers are too close to TDS. If you don't pay attention, you will hurt your plants.

Do not purchase.

ASIN	B06XKMH86J
Amazon 売れ筋ランキング	産業・研究開発用品 - 83,843位 ( 産業・研究開発用品の売れ筋ランキングを見る ) pH計 - 158位
UPC	615435160962
おすすめ度	4.1 5つ星のうち4.1 (23,265) var
ブランド名	VIVOSUN
メーカー名	VIVOSUN
メーカー型番	4336465266
商品の推奨用途	Aquarium, Home Water, Swimming Pool, Water Test
商品の重量	0.1 キログラム
型番	4336465266
無菌評価	0-14
素材	Plastic

VIVOSUN pHが＆TDS計コンボ 0 05ph高精度ペン型pHメーター＆+/- 2％読み出し精度3-in-1 TDS EC温度計 TDS + PH

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