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, 0.01pH High Accuracy Pen Type pH Tester for Hydroponics, Household Drinking, Pool and Aquarium, Yellow, UL Certified

Product ID: 40679482

Details

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

📏0.01 pH precision

🔆Backlit LCD display

🌡️Automatic Temperature Compensation

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$22.07

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Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌟 Precision pH Testing, Elevated for the Modern Pro

COMPACT READY TO GO - Pocket-sized and lightweight with batteries included—perfect for on-the-move professionals.
READ ANYTIME ANYWHERE - Backlit LCD screen delivers crystal-clear readings even in low light—never miss a detail.
SMART TEMPERATURE ADJUSTMENT - Automatic Temperature Compensation (ATC) adapts instantly to water temperature for flawless accuracy.
CERTIFIED QUALITY RELIABILITY - UL certified for trusted performance across home, lab, and commercial environments.
PINPOINT ACCURACY FOR PRO RESULTS - Measures pH with ultra-fine 0.01 precision, ensuring your hydroponics and pools are perfectly balanced.

The VIVOSUN Digital pH Meter is a UL-certified, pen-style tester delivering ultra-precise 0.01 pH readings with automatic temperature compensation. Its backlit LCD and compact design make it ideal for hydroponics, pools, aquariums, and household water testing, backed by included batteries and calibration powders for immediate use.

Specifications

ASIN	B01M5IASHD
Best Sellers Rank	#2,401 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 (8,754)
Included Components	Batteries included
Item Weight	0.11 Kilograms
Manufacturer	VIVOSUN
Material Type	ABS
Model Number	4316344538
Part Number	4316344538
Sterility Rating	0.00-14.00
UPC	714119465581
Unit Count	1.0 Count

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