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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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

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

17757 Ft

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Sold byAmazon HungaryDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Stay ahead of the curve—know your water like a pro!

PORTABLE POWERHOUSE - Lightweight, handheld design with protective case—test anywhere, anytime
CERTIFIED CONFIDENCE - UL certified for trusted reliability and consistent performance
PRECISION P H MASTERY - Ultra-accurate 0.01 pH resolution for flawless water quality insights
TRIPLE THREAT TESTING - 3-in-1 combo measures pH, TDS, EC, and temperature—your all-in-one water quality guru
VERSATILE APPLICATIONS - Perfect for hydroponics, aquariums, pools, and household drinking water—never second guess your water again

The VIVOSUN pH and TDS Meter Combo delivers lab-grade accuracy with 0.01 pH resolution and ±2% TDS readout accuracy. This UL-certified, portable 3-in-1 device measures pH, total dissolved solids, electrical conductivity, and temperature across a broad range, making it ideal for hydroponics, aquariums, pools, and household water testing. Lightweight and equipped with a protective case, it ensures reliable, on-the-go water quality monitoring.

Specifications

ASIN	B06XKMH86J
ASIN	B06XKMH86J
Batteries	1 CR2032 batteries required.
Brand Name	VIVOSUN
Customer Reviews	4.1 4.1 out of 5 stars (23,233)
Customer reviews	4.1 4.1 out of 5 stars (23,233)
Date First Available	11 December 2017
Is Discontinued By Manufacturer	No
Item Weight	0.1 Kilograms
Item model number	4336465266
Manufacturer	VIVOSUN
Manufacturer	VIVOSUN
Material Type	Plastic
Model Number	4336465266
Number of Items	2
Package Dimensions	17.7 x 9.9 x 3.2 cm; 100 g
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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17757 Ft

Duties & taxes included

In stock

Sold byAmazon HungaryDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hungary.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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