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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

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.

Product ID: 255798533

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⚡±2% TDS accuracy

📏0.01 pH precision

🌡️Temp range 0.1-80°C

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Description

💧 Master your water quality like a pro — don’t let your plants or fish down!

CERTIFIED QUALITY ASSURANCE - UL certified for reliability and peace of mind in every measurement.
PORTABLE LAB IN YOUR POCKET - Lightweight, handheld design with protective case for on-the-go testing.
TRIPLE ACTION TESTING POWER - 3-in-1 TDS, EC, and temperature meter covers all your water metrics.
VERSATILE FOR EVERY ENVIRONMENT - Perfect for hydroponics, aquariums, pools, and household drinking water.
PRECISION THAT PROFESSIONALS TRUST - Ultra-fine 0.01 pH resolution for exact water quality insights.

The VIVOSUN pH and TDS Meter Combo offers ultra-precise 0.01 pH measurement and ±2% accuracy for TDS and EC readings, alongside temperature monitoring from 0.1 to 80°C. Designed for hydroponics, aquariums, pools, and household water testing, this lightweight, handheld device comes UL certified and includes calibration buffers and a protective case for professional-grade water quality analysis anytime, anywhere.

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	17.7 x 9.9 x 3.2 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?

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