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.

Ph And Tds Meter Combo 0 05ph High Precision Pen

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Description

🌊 Master your water quality game with precision and style!

PORTABLE POWERHOUSE - Lightweight, handheld design with protective case for on-the-go testing.
SMART STABILITY LOCK - Lock readings instantly for accurate, hassle-free data capture.
TRIPLE THREAT METERING - Seamlessly measure TDS, EC, and temperature in one sleek device.
LONG LASTING PERFORMANCE - 500+ hours battery life with auto shut-off to keep you testing longer.
PRECISION THAT PROFESSIONALS TRUST - Ultra-sensitive 0.05 pH resolution for pinpoint water quality insights.

The VIVOSUN pH & TDS Meter Combo is a professional-grade, handheld water quality tester featuring ultra-precise 0.05 pH resolution, ±2% accuracy for TDS and EC measurements, and a built-in thermometer. Designed for home, aquarium, and pool use, it offers a 3-in-1 solution with a protective case, stable reading lock, and long battery life, making it the go-to tool for millennial managers who demand reliable, on-the-spot water analysis.

Reviews

S**E

TDS meter are working fine but for the PH meter I personally don’t arrive to fully calibrate it as all the time I do the PH 7 then PH 4 and when it’s arrive to do PH 9 it’s return to PH 7 so impossible to complete the calibration.

14.05.2022

S**A

Ich hab den PH-Tester bisher nicht benutzt, kann also nix dazu sagen, ob er funktioniert oder nicht. Den zweiten Tester nutze ich fleißig um die Qualität meines Wassers zu prüfen. Ob die Werte nun 100%ig genau sind oder nicht, kann ich nicht prüfen. Mir reicht es für meine Zwecke zu wissen in welchen Bereich ich mich befinde. Ich brauche keine absolut genauen Werte. Ich für meinen Teil bin zufrieden und bin gespannt wie lange die zwei Tester funktionieren.

22.07.2024

H**N

its as expected

28.12.2021

D**A

Excellent, works well. Just don't have the means to test the accuracy

2.11.2025

V**Y

Very nice

6.04.2026

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Sold byAmazon UKDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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ASIN	B06XKMH86J
Brand Name	VIVOSUN
Customer Reviews	4.1 4.1 out of 5 stars (22,946)
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 Test
Sterility Rating	0-14
UPC	615435160962

pH & TDS Meter Combo 0 05ph High Precision Pen Type pH Meter & +/- 2% Readout Accuracy 3-in-1 TDS EC Thermometer TDS + PH

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