What do you use to clean electrode?

Instructions say to use distilled water to clean electrodes

Would this be a good tool for an aquarium?

Sure it will read the Ph for your tank

Does it work well for testing ph in a saltwater pool?

I don’t know anything about testing pool water but it will definitely give you the ph between 4.0-10

My pen has gone way out of calibration. Is there a way to calibrate it against an accurate test kit? I.e. just set the pH?

I second the answer but Alix. I thought it could be recalibrated against the standards they provide and I would be back to using the ph tool. Once it started to give me bogus readings I knew I had a new paper weight. I even bought 7.0 fluid so I could check it before each use so I knew the readings were correct. I have extensive experience calibrating thousands of gauges in a railroad machine shop to NIST and audited by the ARR annually. Knowing I have a good accurate tool is important to me. The quality of this tool is below the mark. I am surprised as I own VIVOSUN products that are more reliable so I thought I would give it a chance. It lasted almost a year for me.

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VIVOSUN Digital pH Meter 0.01 Accuracy Pen Tester for Water Hydroponics

VIVOSUN Digital pH Meter 0.01 Accuracy Pen Tester for Water Hydroponics

Product ID: 40679482

Details

Brand
VIVOSUN
Manufacturer
VIVOSUN
Ph Range
0.00-14.00
UPC
714119465581
Unit Count
1 Count

💡Backlit LCD for clear visibility anytime

📏±0.01 pH ultra-precision

🌡️ATC for instant temp-adjusted readings

5.66 OMR

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Description

📊 Precision in your pocket, clarity in every drop.

COMPACT READY TO GO - Pocket-sized, lightweight design with included batteries and buffer powders—perfect for on-the-move testing.
SMART TEMPERATURE COMPENSATION - Automatic Temperature Compensation (ATC) ensures instant, reliable readings regardless of water temperature.
EFFORTLESS CALIBRATION MEMORY - Auto calibration paired with memory function means zero guesswork and consistent performance.
VERSATILE FOR EVERY ENVIRONMENT - UL certified and ideal for hydroponics, aquariums, pools, labs, and drinking water—be the expert in any setting.
PRECISION THAT PROFESSIONALS TRUST - Achieve lab-grade ±0.01 pH accuracy for flawless water quality control.

The VIVOSUN Digital pH Meter delivers professional-grade ±0.01 accuracy with automatic temperature compensation and auto calibration. Its backlit LCD and compact design make it perfect for hydroponics, aquariums, pools, and more. UL certified and ready out-of-the-box with batteries and buffer powders, it’s the essential tool for anyone serious about water quality.

Specifications

ASIN	B01M5IASHD
Best Sellers Rank	#1,893 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in Lab pH Meters
Brand Name	VIVOSUN
Customer Reviews	3.8 3.8 out of 5 stars (8,818)
Included Components	Batteries included
Manufacturer	VIVOSUN
Material Type	ABS
Model Number	4316344538
Part Number	4316344538
Sterility Rating	0.00-14.00
UPC	714119465581
Unit Count	1 Count

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