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 Digital pH Meter TDS EC Meter for Water 0.01 Accuracy Hydroponics | ±0.01 pH Accuracy, ATC, Auto Calibration, LCD Display, Hold Function, for Hydroponics Aquarium Pool Drinking, UL Certified

Product ID: 42468543

Details

Brand
VIVOSUN
Manufacturer
VIVOSUN
Ph Range
0-14
Recommended Uses For Product
Aquarium Home
Unit Count
2 Count

📊3-in-1 TDS/EC/Temp meter

⚖️±0.01 pH ultra-precision

🌡️0.1-80°C temperature range

12941 Ft

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Description

💧 Master your water quality like a pro—because precision is power.

TRUSTED BY THOUSANDS - Join over 24,000 satisfied users who rely on VIVOSUN for precise and reliable water testing.
PORTABLE PROTECTIVE DESIGN - Lightweight with a durable case—perfect for on-the-go testing in hydroponics, pools, or aquariums.
SMART AUTO CALIBRATION ATC - Stay confident with automatic calibration and temperature compensation for consistent results.
PRECISION THAT PROFESSIONALS TRUST - Experience lab-grade ±0.01 pH accuracy for flawless water quality readings every time.
ALL IN ONE WATER QUALITY MONITORING - Seamlessly measure pH, TDS, EC, and temperature with a single handheld device.

The VIVOSUN Digital pH Meter TDS EC Meter delivers professional-grade water testing with ±0.01 pH accuracy, 3-in-1 measurement of TDS, EC, and temperature, and smart features like auto calibration and temperature compensation. Lightweight and portable, it’s ideal for hydroponics, aquariums, pools, and home water quality monitoring, backed by UL certification and trusted by thousands of users.

Specifications

ASIN	B06XKMH86J
Best Sellers Rank	#703 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Lab pH Meters
Brand Name	VIVOSUN
Customer Reviews	4.1 4.1 out of 5 stars (24,844)
Included Components	Test pH, TDS, EC & Temp Value
Item Highlight	±0.01 pH Accuracy, ATC, Auto Calibration, LCD Display, Hold Function, for Hydroponics Aquarium Pool Drinking, UL Certified
Item Weight	0.1 kg
Manufacturer	VIVOSUN
Material Type	Plastic
Model Number	4336465266
Number of Items	2
Number of Packs	1
Part Number	4336465266
Recommended Uses For Product	Aquarium, Home Water, Swimming Pool, Water Quality Testing
Sterility Rating	0-14
UPC	615435160962
Unit Count	2 Count

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12941 Ft

Duties & taxes included

In stock

Sold byAmazon HungaryDelivered 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 Hungary.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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