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

€ 62.48

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Sold byAmazon GreeceDelivered 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 Greece.

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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 - 135,540位 ( 産業・研究開発用品の売れ筋ランキングを見る ) pH計 - 226位
UPC	615435160962
pH範囲	0-14
おすすめ度	5つ星のうち4.1 23,276 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

G**I

Buono

Invalid date

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

R**R

as described - good value

Purchased to monitor the effectiveness of my Deionizing Water Filter that I'm using in a very high TDS location (Clearwater). Appears to work, though other that the spot free car wash, or high TDS without filter, very low with, there's no way to quantify the actual TDS numbers The instruments are splash proof at best, so don't submerge and not terribly sturdy, so don't abuse. But good value for electronic instruments you wouldn't expect to be able to own at a low price

Invalid date

A**O

Bien

Muy buenos

Invalid date

W**B

العلبه بدون مسحوق ظبط درجه الحموضه

وصل من غير مسحوق درجه الحموضه

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€ 62.48

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered 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 Greece.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Khalid Z.

Great experience from order to delivery. Highly recommended!

1 week ago

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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