The blue bottom part, where the probe is, what are its dimensions? How thick it is?

The bottom of the blue probe is 3/4" and the probe is tapered. Near the top it is 7/8". The top of the probe around the seal is 1".

I received the tester but when I turn it on ,its reading is r1.2. Is that correct before I test the water reading.

Yes, it's fine. The r1.2 is the software's version number.

What is the settling time for the ORP meter in weak redox solution such as tap water? 20 seconds, 1 minute, hours for stable reading?

I can usually get a nice steady usable reading within 1 minute. If I'm being picky about the accuracy, I'll wait about 5 minutes. If I'm just trying to make a point on showing the antioxidant or oxidating potential of drinking water then I'm looking at about 20-30 seconds per sample of drinking water.

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Description

🔬 Elevate your water quality game with precision and style!

EFFORTLESS CALIBRATION - Auto buffer recognition with 1-3 point calibration means zero guesswork and instant readiness.
ALL IN ONE PORTABLE KIT - Comes complete with calibration solutions, storage bottle, batteries, and premium carrying case—ready for any field mission.
PRECISION YOU CAN TRUST - Achieve lab-grade accuracy with ±0.2% full scale precision, ensuring your measurements are always reliable.
SMART STABILITY DETECTION - Auto hold function locks in stable readings so you never miss the perfect measurement moment.
VIBRANT INTUITIVE DISPLAY - Large backlit LCD with tri-color modes and dual temp/ORP readouts keeps you informed at a glance, day or night.

The Apera Instruments ORP60 is a premium, pocket-sized ORP tester featuring a replaceable platinum sensor, ultra-precise ±0.2% accuracy, and a wide ±1000 mV measurement range. Its smart auto calibration and temperature compensation streamline testing, while a large tri-color backlit LCD ensures clear, dual temperature and ORP readings. Packaged in a rugged, portable kit with all essentials included, it’s designed for professionals demanding reliable, on-the-go water quality analysis.

Specifications

Brand	Apera Instruments
Special Feature	Large Display, Waterproof, Ultra Clear Screen, High Accuracy
Colour	Blue
Included Components	Battery
Outer Material	Plastic
Specification Met	CE
Display Type	LCD
Product Care Instructions	Hand Wash Only
Power Source	Battery Powered
Model Name	AI315
Number of Batteries	4 AAA batteries required. (included)
Upper Temperature Rating	5E+1 Degrees Celsius
Response Time	0.5 Seconds
Reusability	Rechargeable
Indoor/Outdoor Usage	Outdoor
UPC	858718006087
Global Trade Identification Number	00858718006087
Age Range (Description)	Adult
Manufacturer	Shanghai Sanxin Instrumentation
Style	Contemporary
Country of Origin	USA
Model number	AI315
Number of Memory Sticks	1
Item Weight	133 g
Product Dimensions	17.81 x 4.09 x 4.09 cm; 133.24 g
Batteries	4 AAA batteries required. (included)
Item model number	AI315
Item Height	1.61 Inches
Item Width	1.61 Inches
Are batteries included?	Yes

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