What diameter is the probe?

The probes diameter is .575 inches measured with a caliper, a little over 9/16 inch.

Has anyone tested RH accuracy? +/- 5% accuracy for humidity seems a rather large margin of potential error.

Just checked around: The best professional relative humidity meters measure +/-2%. Accuracy is best in the center of the range (50%) and falls off considerably at either end. These very accurate meters (such as the Cooper Atkins Model SRH77A) cost over five hundred dollars. So +/-5% is a great deal for about thirty dollars.

Is this item calibratable?

No! You can not calibrate. Do not buy! I am surprised this thing is still for sale. I returned mine a long time ago all it does is represent a bunch of numbers that are totally inaccurate.

The exterior probe is water proof, but the main portion of the thermometer with the display is not.

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445713 Big Digit Indoor Outdoor Hygro-Thermometer - Large LCD, Temperature & Humidity Display, Min/Max Tracking, Comfort Level Icons, Wall or Desk Mount, Accurate Digital Sensor

Product ID: 2175291

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Details

Brand
Extech
Special Feature
Alarm
Color
green/white
Age Range (Description)
Adult
Included Components
Built-in stand
Outer Material
Plastic

💧Humidity range 10-99% RH

⏱️Fast 500ms response time

🌡️Dual indoor/outdoor temp display

Description

🌿 Stay ahead of your environment with precision you can see!

READY TO USE - Comes with outdoor sensor cable and included AAA battery for immediate setup and continuous monitoring.
MEMORY RECALL FUNCTION - Max/Min readings stored and resettable to track climate trends effortlessly.
VERSATILE INSTALLATION - Includes built-in stand and wall mount bracket for flexible placement anywhere in your space.
DUAL DISPLAY CONVENIENCE - Simultaneously shows indoor and outdoor conditions for instant environmental awareness.
PRECISION CLIMATE TRACKING - Accurately monitors temperature from -10 to 60°C and humidity from 10 to 99% RH with ±1°C and ±5% RH accuracy.

The Extech 445713 Big Digit Indoor/Outdoor Hygro-Thermometer delivers fast, accurate temperature and humidity readings with a clear dual display. Designed for both indoor and outdoor use, it features a memory function for max/min values, flexible mounting options, and comes ready to operate with an included outdoor sensor and battery. Ideal for professionals who demand reliable environmental data at a glance.

Specifications

Brand	Extech
Special Feature	Alarm
Color	green/white
Age Range (Description)	Adult
Included Components	Built-in stand
Outer Material	Plastic
Display Type	Digital
Connectivity Technology	Wired
Product Care Instructions	Wipe Clean
Unit Count	1.0 Count
Power Source	Battery Powered
Model Name	445713
Number of Batteries	1 AAA batteries required. (included)
Item Length	109 Millimeters
Upper Temperature Rating	60 Degrees Celsius
Response Time	500 Milliseconds
Reusability	Reusable
Resolution	±0.1°F or ±0.1°C
Style	445713
Indoor/Outdoor Usage	Outdoor
UPC	793950457139 885510089208
Global Trade Identification Number	00793950457139
Manufacturer	Extech
Part Number	445713
Item Weight	6.3 ounces
Item model number	445713
Batteries	1 AAA batteries required. (included)
Is Discontinued By Manufacturer	No
Material	Plastic
Item Package Quantity	1
Number Of Pieces	1
Measurement Accuracy	+/-0.5%
Special Features	Alarm
Batteries Included?	Yes
Batteries Required?	No
Battery Cell Type	Alkaline
Warranty Description	1 Year

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