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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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

Product ID: 42468543

Details

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

💧TDS up to 9990 ppm

📏0.01 pH precision

🌡️Temp range 0.1-80°C

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Description

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

CERTIFIED RELIABILITY - UL certified with ±2% accuracy, trusted by thousands for consistent, dependable readings.
PORTABLE READY FOR ACTION - Lightweight pen design with protective case—perfect for on-the-go professionals and hobbyists alike.
TRIPLE ACTION TESTING POWER - Simultaneously measure pH, TDS, EC, and temperature for comprehensive water analysis.
VERSATILE FOR EVERY WATER SOURCE - Ideal for hydroponics, aquariums, pools, and home water testing—be the water quality guru in your circle.
LAB GRADE PRECISION AT YOUR FINGERTIPS - Ultra-sensitive 0.01 pH resolution ensures you never miss a detail in water quality.

The VIVOSUN Digital pH and TDS Meter Kit offers ultra-precise 0.01 pH resolution and ±2% accuracy across pH, TDS, EC, and temperature measurements. Designed for professionals and enthusiasts, its lightweight pen-style design and protective case make it ideal for hydroponics, aquariums, pools, and home water quality testing. UL certified and highly rated, this 3-in-1 meter delivers reliable, fast readings to keep your water conditions perfectly balanced.

Specifications

ASIN	B06XKMH86J
Best Sellers Rank	#657 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Lab pH Meters
Brand Name	VIVOSUN
Customer Reviews	4.1 4.1 out of 5 stars (24,595)
Included Components	Test pH, TDS, EC & Temp Value
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 Quality Testing
Sterility Rating	0-14
UPC	615435160962

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4217 kr

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In stock

Sold byAmazon IcelandDelivered 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 Iceland.

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