How often does this pH meter need to be re-calibrated and/or how can I tell when it needs to be re-calibrated?

The manufacturer recommends keeping the device probe in a neutral storage solution; the protective tip case/container actually has a 'fill' line for guidance, and it is designed to hold a liquid safely when stored as indicated -- If someone uses distilled or deionized water by itself as a storage solution, the salts contained in the probe tip will dissipate and the probe will then need to be replaced--about $25, plus a fine headache trying to get it right. If you are out of storage solution keeping the probe wet somehow is better than dry--but don't store without the specialized solution for more than a day or so; these are typically $10-$13 for 100ml - 250ml size bottles on Amazon.

Can anyone confirm if this comes pre calibrated?

Mine was, the PH20 unit. Dead on, but I still did the cal to know how. If you use it for pH 8.0 or lower, the 4.00 and 7.00 solutions are perfect-no need for 10.00 test buffer solution. I am AMAZED at how bad my cheapy meters are, and how they disagree with each other and this one.

Can this be used to analyze urine?

Yes, it can tests urine with no problem. You can use the probe cap as a container for the urine.

I will be using this meter once a month. Do I need storage solution for the probe?

Storing the probe in the storage solution helps keep the probe's sensitivity and accuracy. So it's a recommended practice. While storing the probe without any solution will not damage the probe, it's just going to cause the probe to lose its sensitivity and accuracy temporarily. Store the probe in the storage solution again for about 10 minutes, the sensitivity and accuracy can be restored.

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Apera Economy Type pH Meter PH20 Pen-Type pH Meter Digital pH Meter Essential pH Measurement Instrument for Water Quality Testing in Aquariums/Fish Tanks Accuracy: ±0.1 pH/Measurement Range: 0~14.0 pH

Apera Economy Type pH Meter PH20 Pen-Type pH Meter Digital pH Meter Essential pH Measurement Instrument for Water Quality Testing in Aquariums/Fish Tanks Accuracy: ±0.1 pH/Measurement Range: 0~14.0 pH

Product ID: 732904565

Details

Age Range (Description)
Adult
Brand
Apera
Color
Regular Kit
Display Type
Digital
Included Components
pH standard x
Outer Material
Plastic

💧IP67 waterproof & dustproof

📏±0.1 pH accuracy

🌡️Auto temp compensation 0-50°C

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KSh1946000

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Description

💧 Stay ahead in water quality with precision that professionals rely on!

BUILT TO LAST - IP67 waterproof design and up to 2,000 hours battery life keep you measuring anywhere.
DUAL DISPLAY POWER - Simultaneous pH and temperature readouts—no extra tools needed.
READY OUT OF THE BOX - Includes calibration solutions and batteries for instant, hassle-free use.
PRECISION YOU CAN TRUST - Ultra-accurate ±0.1 pH readings for flawless water quality control.
SMART STABILITY INDICATOR - Easy-to-read stability mark ensures you never guess your measurement timing.

The Apera PH20 is a professional-grade, pen-type digital pH meter offering ±0.1 pH accuracy and automatic temperature compensation from 0 to 50°C. Featuring a dual LCD display for pH and temperature, IP67 waterproof rating, and up to 2,000 hours of battery life, it’s designed for reliable, on-the-go water quality testing in aquariums, hydroponics, and environmental monitoring. The kit includes calibration solutions, batteries, and a hard case, backed by a 2-year product warranty and 6-month electrode warranty.

Specifications

ASIN	B01ENFOHN8
Additional Features	Waterproof
Age Range Description	Adult
Amazon Bestseller	#11,570 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #20 in Lab pH Meters
Brand Name	Apera Instruments
Color	Regular Kit
Customer Reviews	4.0 4.0 out of 5 stars (8,560)
Display Type	Digital
Global Trade Identification Number	00858718006339
Included Components	pH standard liquid (4.01/6.86) x 1 each, 4 AAA batteries (installed), strap, hard case
Indoor Outdoor Usage	Outdoor
Item Length	218 Millimeters
Item Weight	3.9 Ounces
LowerTemperature Range	32 Degrees Fahrenheit
Manufacturer	アペラインスツルメンツ(Apera Instruments)
Model	PH20
Model Name	PH20
Number of Batteries	4 AAA batteries required. (included)
Outer Material	Plastic
Part Number	AI209
Power Source	Battery Powered
Product Care Instructions	Hand Wash Only
Reusability	Rechargeable
Specification Met	NIST
Style Name	Standard Kit
UPC	858718006339
Unit Count	1 Count
Upper Temperature Range	50 Degrees Celsius
Warranty Description	2 years after purchase, electrode 6 months

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