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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🌊 Dive into precision—measure like a pro, anywhere, anytime!

DUAL DISPLAY POWER - Simultaneously monitor pH and temperature on a clear LCD—no extra thermometer needed.
READY OUT OF THE BOX - Includes pH standard liquids, batteries, strap, and hard case so you can start testing immediately.
EFFORTLESS CALIBRATION - Flexible 1 to 3-point calibration ensures your measurements stay spot-on every time.
PRECISION YOU CAN TRUST - Accurate ±0.1 pH readings with fast, responsive glass electrode for reliable water quality checks.
BEGINNER FRIENDLY STABILITY - Measurement stability indicator lets you know exactly when to record readings—no guesswork.

The APERA Economy Type PH 20 is a digital pen-style pH meter designed for aquarium and water quality monitoring. Featuring ±0.1 pH accuracy, simultaneous temperature display with automatic compensation, and a waterproof build, it offers reliable, fast, and easy-to-use measurements. Complete with calibration solutions, batteries, and protective case, it’s a trusted tool favored worldwide with a 2-year warranty.

Specifications

Manufacturer	アペラインスツルメンツ(Apera Instruments)
Part number	AI209
Item Weight	110 g
Product Dimensions	17.8 x 4.1 x 3 cm; 110.56 g
Batteries	4 AAA batteries required. (included)
Is Discontinued By Manufacturer	No
Size	Regular Kit
Color	Regular kit
Style	Standard Kit
Material	plastic glass
Pattern	Single Item
Power source type	Battery Powered
Measurement System	default_no_selection_value
Display Style	Digital
Specification met	NIST
Special Features	Waterproof
Included Components	pH standard liquid (4.01/6.86) x 1 each, 4 AAA batteries (installed), strap, hard case
Batteries Included	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Item Dimensions LxWxH	17.8 x 4.1 x 3 cm

APERA Economy Type PH 20 Pen Type pH Meter, Digital pH Meter, Pier Measuring Instrument Indispensable for Aquariums, Aquariums and Aquariums and Other Water Quality Inspection Accuracy: ±0.1 pH /

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