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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Extech 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

Details

Age Range (Description)
Adult
Brand
Extech
Color
green/white
Connectivity Technology
Wired
Display Type
Digital
Included Components
Built-in stand

📈Max/Min memory tracks climate trends

📊Oversized LCD digits for instant readability

🌡️Accurate ±1.8°F/±1°C temperature sensor

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Description

🌿 Stay ahead of the comfort curve with precision you can see!

RELIABLE READY - Battery-powered with fast 500ms response time and built-in alarm for proactive climate control.
DATA DRIVEN COMFORT - Max/Min memory recalls daily highs and lows, empowering you to optimize your environment.
DUAL ZONE MONITORING - Remote probe sensor delivers real-time outdoor data alongside indoor conditions for smart comparisons.
SEAMLESS VERSATILITY - Compact design with wall mount or desk stand fits effortlessly into any professional or home setting.
INSTANT CLIMATE CLARITY - Oversized big-digit LCD ensures you never miss a beat on indoor/outdoor temp & humidity.

The Extech 445713 Big Digit Indoor Outdoor Hygro-Thermometer features a large LCD display for easy reading of temperature and humidity both indoors and outdoors via a remote sensor. It offers precise measurements with ±5% RH and ±1.8°F accuracy, tracks max/min values for trend analysis, and includes comfort level icons. Designed for versatile placement with wall or desk mounting, it’s battery-powered for portability and quick 500ms response, making it an essential tool for maintaining optimal climate in homes, offices, or specialized environments.

Specifications

ASIN	B000WTH3NQ
Additional Features	Alarm
Age Range (Description)	Adult
Age Range Description	Adult
Best Sellers Rank	#254,569 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #410 in Weather Thermometers
Brand	Extech
Brand Name	Extech
Color	green/white
Connectivity Technology	Wired
Customer Reviews	4.2 out of 5 stars 85 Reviews
Display Type	Digital
Global Trade Identification Number	00793950457139
Included Components	Built-in stand
Indoor Outdoor Usage	Indoor, Outdoor
Item Length	109 Millimeters
Item Weight	0.18 Kilograms
LowerTemperature Range	14 Degrees Fahrenheit
Manufacturer	Extech
Model	445713
Model Name	445713
Number of Batteries	1 AAA batteries required. (included)
Outer Material	Plastic
Part Number	445713
Power Source	Battery Powered
Product Care Instructions	Wipe Clean
Resolution	±0.1°F or ±0.1°C
Response Time	500 Milliseconds
Reusability	Reusable
Smart Home Compatibility	Not Smart Home Compatible
Special Feature	Alarm
Style Name	445713
UPC	793950457139 885510089208
Unit Count	1.0 Count
Upper Temperature Range	60 Degrees Celsius
Warranty Description	1 Year

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107854CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

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