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

🔋Built-in batteries included

🌡️Automatic Temperature Compensation (ATC)

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5.60 OMR

Duties & taxes included

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Description

🌿 Master your grow with precision—because your plants deserve the best!

READY WHEN YOU ARE - Comes with built-in batteries and calibration powders—no extra purchases, no downtime.
COMPACT USER FRIENDLY - Pocket-sized, lightweight design with a clear backlit LCD screen for effortless use anytime, anywhere.
SMART TEMPERATURE ADJUSTMENT - ATC technology instantly adapts readings to water temperature for flawless accuracy.
VERSATILE FOR EVERY ENVIRONMENT - Perfect for hydroponics, pools, aquariums, labs, and household water testing—be the expert in any setting.
PINPOINT ACCURACY FOR PRO RESULTS - Ultra-fine 0.01 pH resolution ensures your measurements are lab-grade precise every time.

The VIVOSUN Digital pH Meter delivers professional-grade 0.01 pH accuracy with automatic temperature compensation, making it ideal for hydroponics, aquariums, pools, and household water testing. Its compact, lightweight design features a backlit LCD for easy reading, and it comes complete with batteries and calibration powders for immediate use. UL certified and trusted by thousands, this pen-type tester empowers growers and professionals to achieve optimal water quality with scientific precision.

Specifications

ASIN	B01M5IASHD
Best Sellers Rank	#2,437 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 (8,738)
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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