VIVOSUN 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

VIVOSUN 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

Q: 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.

Q: 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

Q: 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

Q: 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.

4.0/5

Product ID: 255798533

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📏pH range 0-14

⚖️±2% readout accuracy

🌡️Temp range 0.1-80°C

Frequently Bought Together

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

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Description

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

PORTABLE READY TO GO - Lightweight, handheld design with protective case means you can test anywhere, anytime.
WIDE MEASUREMENT RANGE - Full pH scale 0-14 and TDS up to 9990 ppm cover all your water quality needs.
PRECISION YOU CAN TRUST - Ultra-accurate ±2% readings for pH, TDS, and temperature ensure your data is always reliable.
ALL IN ONE TESTING POWER - 3-in-1 combo meter measures pH, TDS, EC, and temperature—perfect for hydroponics, aquariums, and drinking water.
CERTIFIED QUALITY ASSURANCE - UL certified for safety and performance—because your water deserves the best.

The VIVOSUN pH and TDS Meter Combo is a UL certified, handheld device offering high-accuracy (±2%) measurements across pH (0-14), TDS (0-9990 ppm), EC, and temperature (0.1-80°C). Designed for hydroponics, aquariums, and household water testing, it comes with a protective case and calibration buffers for reliable, on-the-go water quality monitoring.

Specifications

Package Dimensions	17.5 x 10.02 x 3.4 cm; 100 g
Part number	4336465266
Item display length	6.1 inches
Item display width	1.22 inches
Item display weight	100 Grams
Material type	Plastic
Manufacturer	VIVOSUN
Item model number	4336465266
ASIN	B06XKMH86J

I have purchased 2 of these, why are they so inaccurate?

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?

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 I choose EC, does it retain the setting after power cycles?

Reviews

4.0

All from verified purchases

H**N

good

its as expected

28.12.2021

J**K

For fish aquarium

Excellent

24.10.2020

K**A

Good addition to my toolset

Very good quality

5.10.2024

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VIVOSUN 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

Description

Specifications

Reviews

Common Questions