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 & TDS Meter Combo 0 05ph High Precision Pen Type pH Meter & +/- 2% Readout Accuracy 3-in-1 TDS EC Thermometer TDS + PH

pH & TDS Meter Combo 0 05ph High Precision Pen Type pH Meter & +/- 2% Readout Accuracy 3-in-1 TDS EC Thermometer TDS + PH

Product ID: 726715165

Details

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

🔋500+ hours battery life

⚖️±0.05 pH accuracy

🌡️3-in-1 TDS, EC & Temp

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Description

💧 Master your water quality game with precision and style!

LONG LASTING POWER - Over 500 hours of continuous use with energy-efficient auto shut-off to keep you testing longer.
PRECISION YOU CAN TRUST - Ultra-accurate pH readings with ±0.05 precision for flawless water quality control.
EFFORTLESS CALIBRATION USE - 2-point automatic calibration and locking function for stable, reliable results every time.
ALL IN ONE WATER QUALITY MASTER - Seamlessly measure TDS, EC, and temperature in one sleek, portable device.
BUILT FOR ON THE GO PROFESSIONALS - Lightweight, handheld design with protective case—perfect for field or lab testing.

The VIVOSUN pH & TDS Meter Combo is a professional-grade, pen-type water quality tester offering ultra-precise pH measurement (±0.05 accuracy) and a versatile 3-in-1 TDS, EC, and temperature meter. Designed for home, aquarium, and pool use, it features automatic 2-point calibration, a locking function for stable readings, and a lightweight, portable design with protective case. Powered by long-lasting button batteries, it delivers over 500 hours of reliable testing with a 5-minute auto shut-off to conserve energy.

Specifications

ASIN	B06XKMH86J
Brand Name	VIVOSUN
Customer Reviews	4.1 4.1 out of 5 stars (23,023)
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 Test
Sterility Rating	0-14
UPC	615435160962

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