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: 218356123

Details

Brand
VIVOSUN
Manufacturer
VIVOSUN
Recommended uses for product
hydroponics
UPC
615435160962
pH range
0-14

🔬pH 0-14 full measurement range

⚖️±2% readout accuracy

🌡️0.1-80°C temperature range

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Description

🌿 Measure Like a Pro, Grow Like a Boss!

PORTABLE POWERHOUSE - Lightweight, pen-style design with a protective case for on-the-go testing convenience.
TRUSTED CERTIFIED - UL certified quality with over 22,000 positive reviews—join the savvy pros who rely on VIVOSUN.
ALL IN ONE HYDROPONICS HERO - 3-in-1 meter measures pH, TDS, EC, and temperature—perfect for pools, aquariums, and hydroponics.
PRECISION AT YOUR FINGERTIPS - Ultra-accurate ±2% readings for pH, TDS, and EC ensure you never miss a detail.
READY TO CALIBRATE READY TO GO - Includes 3 calibration buffers and spare batteries so you’re always set for precision.

The VIVOSUN Digital pH and TDS Meter Kit is a UL certified, handheld 3-in-1 device offering precise measurements of pH (0-14), TDS (0-9990 ppm), EC, and temperature (0.1-80°C) with ±2% accuracy. Designed for hydroponics, pools, and aquariums, it comes complete with calibration buffers and a protective case, making it the go-to tool for professionals and enthusiasts seeking reliable, portable water quality testing.

Specifications

ASIN	B06XKMH86J
Best Sellers Rank	9,715 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 15 in Lab pH Meters
Brand	VIVOSUN
Country Of Origin	China
Customer Reviews	4.1 4.1 out of 5 stars (22,954)
Item Weight	0.1 Kilograms
Manufacturer	VIVOSUN
Manufacturer Part Number	4336465266
Material Type	PLA_(Polylactic_Acid), PE_(Polyethylene), Plastic
Model Number	4336465266
Recommended Uses For Product	hydroponics, drinking water, aquariums
Sterility Rating	0-14
UPC	615435160962

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