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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Digital pH and TDS Meter Kits, 0.01pH High Accuracy Pen Type pH Meter ± 2% Readout Accuracy 3-in-1 TDS EC Temperature Meter for Hydroponics, Pool and Aquarium, Yellow Blue, UL Certified

Product ID: 42468543

Details

Brand
VIVOSUN
Manufacturer
VIVOSUN
Ph Range
0-14
Recommended Uses For Product
Aquarium Home
UPC
615435160962

⚡±2% TDS accuracy

📏0.01 pH precision

🌡️3-in-1 TDS, EC & Temp

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฿1510

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Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
VIVOSUN
Manufacturer
VIVOSUN
Ph Range
0-14

Description

🌿 Master your water quality like a pro — precision meets convenience in one sleek kit!

PINPOINT PRECISION - Ultra-fine 0.01 pH resolution for flawless water quality control
PORTABLE POWERHOUSE - Lightweight, handheld design with automatic on/off for effortless, on-the-go testing
TRIPLE THREAT METER - 3-in-1 TDS, EC, and temperature readings to master your hydroponics or pool setup
COLOR CODED CONVENIENCE - Distinct yellow & blue pens for instant, error-free meter selection
COMPLETE CALIBRATION KIT - Includes 3 calibration buffers and protective case for professional-grade accuracy every time

The VIVOSUN Digital pH and TDS Meter Kit offers ultra-precise 0.01 pH measurement and ±2% accuracy for TDS, EC, and temperature, all in a compact, color-coded pen design. Perfect for hydroponics, aquariums, and pools, it includes calibration buffers and a protective case, ensuring reliable, professional-grade water quality monitoring wherever you go.

Specifications

ASIN	B06XKMH86J
Best Sellers Rank	#646 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Lab pH Meters
Brand	VIVOSUN
Brand Name	VIVOSUN
Customer Reviews	4.1 out of 5 stars 24,400 Reviews
Included Components	Test pH, TDS, EC & Temp Value
Item Weight	0.1 Kilograms
Manufacturer	VIVOSUN
Material	Plastic
Material Type	Plastic
Ph Range	0-14
Recommended Uses For Product	Aquarium, Home Water, Swimming Pool, Water Test
Sterility Rating	0-14
UPC	615435160962

Reviews

E**A

25.03.2026

P**O

10.04.2026

D**S

25.10.2025

J**K

9.01.2026

J**H

5.02.2026

J**N

1.04.2026

C**R

3.04.2026

R**B

28.07.2025

C**G

13.02.2026

A**A

22.03.2026

S**E

14.05.2022

S**A

22.07.2024

C**S

29.03.2026

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