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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⚡±2% TDS accuracy

📏0.01 pH precision

🌡️Temp range 0.1-80°C

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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

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Description

🌿 Stay ahead in the clean water game with precision you can trust!

CERTIFIED RELIABILITY - UL certified for trusted performance and durability in professional and home settings.
PRECISION P H READINGS - Ultra-fine 0.01 pH resolution for lab-grade accuracy in every test.
PORTABLE LIGHTWEIGHT - Compact 100g design with protective case—take it anywhere, test anytime.
WIDE MEASUREMENT RANGE - pH 0-14 and TDS up to 9990 ppm cover all your hydroponic, aquarium, and household needs.
3 IN 1 MULTI FUNCTION METER - Combine pH, TDS, EC, and temperature measurements in one sleek device.

The VIVOSUN pH and TDS Meter Combo delivers lab-accurate 0.01 pH resolution and ±2% TDS accuracy in a portable, UL-certified device. Designed for hydroponics, aquariums, and household water testing, it combines pH, TDS, EC, and temperature measurements in one lightweight pen with a protective case, ensuring reliable, on-the-go water quality monitoring.

Specifications

Color	Combo
Size	6.1x1.22 in
Length	6.1 inches
Weight	100 Grams
Width	1.22 inches
Material Type	Plastic
Batteries Included?	No
Brand	VIVOSUN
Manufacturer	VIVOSUN
Item model number	4336465266
Package Dimensions	17.5 x 10.02 x 3.4 cm; 100 g
ASIN	B06XKMH86J

Have a Question? See What Others Asked

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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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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