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 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

📏0.01 pH precision

🔬±2% TDS accuracy

🌡️Temp range 0.1-80°C

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Description

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

PORTABLE POWERHOUSE - Lightweight pen design with protective case—test anywhere, anytime.
CERTIFIED CONFIDENCE - UL certified for trusted performance in home and lab environments.
PINPOINT P H PRECISION - Ultra-fine 0.01 pH resolution for flawless water quality control.
USER FRIENDLY CALIBRATION - Comes with 3 calibration buffers and easy instructions for reliable accuracy every time.
TRIPLE CHECK WATER METRICS - 3-in-1 TDS, EC, and temperature readings keep your hydroponics and pools perfectly balanced.

The VIVOSUN Digital pH and TDS Meter Kit offers ultra-precise 0.01 pH measurement, ±2% accuracy for TDS and EC, and temperature monitoring from 0.1 to 80°C. Designed for hydroponics, pools, and aquariums, this UL-certified, portable pen-style kit includes calibration buffers and a protective case, delivering professional-grade water testing in a compact, easy-to-use package.

Specifications

ASIN	B06XKMH86J
Best Sellers Rank	#1,002 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 (24,595)
Included Components	Test pH, TDS, EC & Temp Value
Item Weight	0.1 Kilograms
Manufacturer	VIVOSUN
Material Type	Plastic
Model Number	4336465266
Part Number	4336465266
Recommended Uses For Product	Aquarium, Home Water, Swimming Pool, Water Quality Testing
Sterility Rating	0-14
UPC	615435160962

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

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