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.

ASIN	B01ENFOHN8
Age Range (Description)	Adult
Batteries	4 AAA batteries required. (included)
Best Sellers Rank	#2,706 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Lab pH Meters
Brand	Apera Instruments
Color	Regular Kit
Date First Available	April 22, 2016
Display Type	Digital
Global Trade Identification Number	00858718006339
Included Components	PH20 Value pH tester kit
Indoor/Outdoor Usage	Outdoor
Is Discontinued By Manufacturer	No
Item Length	218 Millimeters
Item Weight	3.9 ounces
Item model number	PH20
Lower Temperature Rating	32 Degrees Fahrenheit
Manufacturer	Apera Instruments
Model Name	PH20
Number of Batteries	4 AAA batteries required. (included)
Outer Material	Plastic
Power Source	Battery Powered
Product Care Instructions	Hand Wash Only
Reusability	Reusable
Special Feature	Waterproof
Specification Met	CE, ISO 9001, RoHS
Style	Regular Kit
UPC	858718006339
Unit Count	1.0 Count
Upper Temperature Rating	50 Degrees Celsius

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

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