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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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)

Product ID: 231974651

🌈0–14 full pH range

👜pocket-size portability

📏±0.01 high accuracy

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฿1040

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Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Stay ahead of water quality with precision you can trust!

COMPACT POWERHOUSE - Sleek, pocket-sized design fits effortlessly into your daily carry.
EFFORTLESS OPERATION - One-button start and quick stabilization for hassle-free measurements anywhere.
UNIVERSAL P H COVERAGE - Measures the entire pH spectrum from 0 to 14 for versatile water testing.
MULTI ENVIRONMENT READY - Perfect for drinking water, pools, aquariums, hydroponics, and more.
PRECISION AT YOUR FINGERTIPS - Pre-calibrated for instant, reliable pH readings with ±0.01 accuracy.

This Digital pH Meter Tester Pen offers professional-grade accuracy (±0.01) across the full 0–14 pH range, pre-calibrated for immediate use. Its compact, pocket-sized design ensures you can monitor water quality anytime, anywhere—ideal for drinking water, pools, aquariums, and hydroponic systems. Reliable, easy-to-use, and versatile, it’s the essential tool for maintaining optimal water conditions with confidence.

Specifications

ASIN	B08HLXBBK4
Batteries	1 CR2 batteries required.
Best Sellers Rank	#1,254 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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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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