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

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.

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?

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

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?

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

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

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.

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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

Product ID: 726715165

Details

UPC
615435160962
pH範囲
0-14
ブランド
VIVOSUN
メーカー
VIVOSUN
製品の推奨用途
Aquarium Home

📏0.05 pH precision

🔋500+ hours battery life

🌡️3-in-1 TDS, EC & Temp

$102.25

Duties & taxes included

In stock

Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Ecuador.

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Description

💧 Master your water quality game with precision and ease!

LOCK READ - Lock function stabilizes readings so you never miss a critical data point during testing.
ON THE GO READY - Lightweight design with protective case and 500+ hours battery life keeps you testing anywhere, anytime.
PINPOINT ACCURACY - Ultra-precise pH readings with 0.05 resolution for flawless water quality control.
TRIPLE THREAT METER - Seamlessly measure TDS, EC, and temperature in one sleek, portable device.
EFFORTLESS CALIBRATION - 2-point automatic calibration ensures reliable results every time—no guesswork needed.

The VIVOSUN pH & TDS Meter Combo is a professional-grade, handheld water quality tester combining ultra-precise pH measurement (0-14 range, 0.05 resolution) with a 3-in-1 TDS, EC, and temperature meter. Featuring automatic 2-point calibration, a locking function for stable readings, and over 500 hours of battery life, it’s perfect for aquariums, pools, and home or lab water testing. Compact and portable with a protective case, it delivers reliable, fast, and accurate results wherever you need them.

Specifications

ASIN	B06XKMH86J
Amazon 売れ筋ランキング	産業・研究開発用品 - 168,030位 ( 産業・研究開発用品の売れ筋ランキングを見る ) pH計 - 300位
UPC	615435160962
pH範囲	0-14
おすすめ度	5つ星のうち4.1 23,359 レビュー
ブランド	VIVOSUN
ブランド名	VIVOSUN
メーカー	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
材質	Plastic
無菌評価	0-14
素材	Plastic
製品の推奨用途	Aquarium, Home Water, Swimming Pool, Water Test

Reviews

S**E

TDS good PH not really

TDS meter are working fine but for the PH meter I personally don’t arrive to fully calibrate it as all the time I do the PH 7 then PH 4 and when it’s arrive to do PH 9 it’s return to PH 7 so impossible to complete the calibration.

Invalid date

A**O

Bien

Muy buenos

Invalid date

U**N

Great value for a reliable meter!

If you’re looking for an affordable way to check pH, TDS, and EC without spending a lot of money, this is a great option. It gives you several useful readings in one device and is much more convenient than buying separate meters. The readings have been consistent for what I need, and the auto-calibration and temperature compensation make it easy to get started without a lot of messing around. The display is easy to read, and having the hold function is a nice bonus. For the price, I really don’t think you need to spend more unless you have a specific reason to buy a higher-end professional meter. This one gives you the important functions at a fraction of the cost. Definitely one of those purchases where you get a lot for your money.

Invalid date

W**B

العلبه بدون مسحوق ظبط درجه الحموضه

وصل من غير مسحوق درجه الحموضه

Invalid date

K**E

Vivosun Messgeräte

Sehr schnelle Lieferung bin mit zufrieden im Langzeittest werden sie sich noch beweisen müssen

Invalid date

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$102.25

Duties & taxes included

In stock

Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Ecuador.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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