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 INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy

APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy

Product ID: 34756289

Details

Age Range (Description)
Adult
Brand
Apera
Color
Regular Kit
Display Type
Digital
Included Components
PH20 Value pH
Outer Material
Plastic

💧IP67 waterproof rating

🔋2000 hrs battery life

⏱️5-sec fast response

445 zł

Duties & taxes included

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Sold byAmazon PolandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Stay sharp, stay precise — the pH tester that works as hard as you do.

ALL WEATHER READY - IP67 waterproof design and auto temperature compensation keep readings accurate rain or shine.
LONG LASTING POWER - Up to 2000 hours of continuous operation powered by included AAA batteries—stay testing without interruption.
READY OUT OF THE BOX - Complete kit with calibration solutions, batteries, and rugged carrying case for instant use anywhere.
EFFORTLESS CALIBRATION - Auto buffer recognition and 3-point calibration make setup a breeze—no guesswork needed.
PRECISION AT YOUR FINGERTIPS - ±0.1 pH accuracy ensures lab-grade reliability for every test.

The APERA INSTRUMENTS AI209 PH20 is a professional-grade, waterproof pH tester kit delivering ±0.1 accuracy with fast 5-second readings. Featuring automatic 3-point calibration, buffer recognition, and temperature compensation, it ensures consistent, reliable results across diverse environments. Packaged with calibration solutions, batteries, and a rugged case, it offers up to 2000 hours of battery life, making it the ultimate tool for hydroponics, water quality monitoring, and more.

Specifications

ASIN	B01ENFOHN8
Additional Features	Waterproof
Age Range Description	Adult
Battery Life	2000 hours
Best Sellers Rank	#3,423 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Lab pH Meters
Brand Name	Apera Instruments
Color	Regular Kit
Customer Reviews	4.4 4.4 out of 5 stars (8,860)
Display Type	Digital
Global Trade Identification Number	00858718006339
Included Components	PH20 Value pH tester kit
Indoor Outdoor Usage	Outdoor
Item Length	21.8 centimeters
Item Weight	3.9 ounces
LowerTemperature Range	32 °F
Manufacturer	Apera Instruments
Model	AI209
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
Response Time	5 seconds
Reusability	Reusable
Specification Met	CE, ISO 9001, RoHS
Style Name	Regular Kit
UPC	858718006339
Unit Count	1 Count
Upper Temperature Range	50 °C
Warranty Description	Two-Year limited warranty for the instrument, Six-Month limited warranty for the electrode(s).

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