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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pH and TDS Meter Combo, 0.01ph High Accuracy Pen Type pH Meter ± 2% Readout Accuracy 3-in-1 TDS EC Temperature Meter for Hydroponics, Household Drinking, and Aquarium, UL Certified

Product ID: 255798533

Details

Brand
VIVOSUN
Manufacturer
VIVOSUN
Recommended uses for product
Aquarium Pool
Unit count
2 Count
pH range
0-14

💧TDS up to 9990 ppm

📏0.01 pH precision

🌡️Temp range 0.1-80°C

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Description

💧 Stay ahead of the curve with precision water testing in your pocket!

CERTIFIED RELIABILITY - UL certified for trusted performance and peace of mind in every test
PORTABLE PROTECTIVE - Lightweight handheld design with a durable protective case for on-the-go testing
PRECISION P H READINGS - Ultra-accurate 0.01 pH resolution for flawless water quality insights
VERSATILE APPLICATIONS - Perfect for hydroponics, aquariums, pools, and household drinking water monitoring
3 IN 1 WATER TESTING POWER - Combine pH, TDS, EC, and temperature measurements in one sleek device

The VIVOSUN pH and TDS Meter Combo offers professional-grade water quality testing with ultra-precise 0.01 pH accuracy, a broad TDS range up to 9990 ppm, and temperature measurement from 0.1 to 80°C. Designed for hydroponics, aquariums, pools, and household use, this lightweight, UL-certified device comes with a protective case and calibration buffers, ensuring reliable, on-the-go water analysis.

Specifications

ASIN	B06XKMH86J
Brand Name	VIVOSUN
Customer Reviews	4.1 4.1 out of 5 stars (22,956)
Item Weight	0.1 Kilograms
Manufacturer	VIVOSUN
Material Type	Plastic
Model Number	4336465266
Part Number	4336465266
Recommended Uses For Product	Aquarium, Swimming Pool, Household Drinking Water
Sterility Rating	0-14
UPC	615435160962
Unit Count	2 Count

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VT10721

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