How do I get warranty support? I have had this for 3 months and it quit working, just shows zero with an occasional flash of random numbers.

It's the horrible design in the battery tray. The pressure that keeps the metal contacts down also lifts the entire battery tray away from it's case making it lose contact. You can try to press them back but it will only happen again.

can i get more Calibration powder?

Yes, available on Amazon. I use liquid ph 7 which I think is more economical and much simpler to use.

where are the batteries? it says included. are they installed inside? Mine won't turn on

Yes they are installed. They are most likely dead, both meters I received came with dead batteries. The thin black cap comes off if the push in the release on the back and pull it up.

Can this be used to test the pH of automotive coolant in your radiator??

Yes. It’s a general liquid ph meter

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Description

💧 Master your water’s chemistry anytime, anywhere — because precision is the new power.

POCKET SIZED POWER - Compact, lightweight design fits effortlessly in your pocket for on-the-go testing.
ALL IN ONE P H RANGE - Measures full 0-14 pH spectrum—perfect for water, pools, aquariums, and hydroponics.
SMART CALIBRATION INCLUDED - Comes with calibration powders and easy 3-point calibration for reliable, consistent results.
PRECISION AT YOUR FINGERTIPS - Ultra-sensitive 0.01 pH resolution for lab-grade accuracy in everyday use.
TEMPERATURE COMPENSATED READINGS - Automatic temperature adjustment ensures accurate pH values regardless of water temperature.

The Ruolan Digital pH Meter Pen delivers lab-accurate 0.01 resolution across the full 0-14 pH range in a sleek, pocket-sized design. Equipped with automatic temperature compensation and easy 3-point calibration using included powders, it’s ideal for hydroponics, aquariums, pools, and household water testing. Lightweight and portable, it empowers professionals and enthusiasts alike to monitor water quality with confidence wherever they go.

Specifications

ASIN	B08HLXBBK4
Batteries	1 CR2 batteries required.
Best Sellers Rank	#1,247 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Lab pH Meters
Date First Available	September 7, 2020
Item Weight	3.52 ounces
Manufacturer	Ruolan
Package Dimensions	6.85 x 2.13 x 1.26 inches

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Digital pH Meter Tester Pen for Water, Pre-Calibrated, High Accuracy ±0.01, 0–14 pH Range, Pocket Size for Drinking Water, Pool, Aquarium & Hydroponics (Yellow)

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