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 | Indoor/outdoor temp and humidity, remote probe, MIN/MAX, comfort icons, wall or desk mount

Product ID: 2175291

Details

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

⏳Min/Max memory tracks climate trends

📊Large LCD with oversized digits

🌡️Accurate indoor/outdoor temp & humidity sensor

80626CFA

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Stay ahead of comfort with precision you can see!

RELIABLE READY - Battery-powered with fast 500ms response time, built for consistent, accurate performance anywhere.
FLEXIBLE PLACEMENT - Compact design with wall mount or desk stand fits seamlessly into any professional or home setting.
DATA DRIVEN DECISIONS - Min/Max memory function captures daily highs and lows, empowering smarter environment control.
INSTANT COMFORT CHECK - Oversized big-digit LCD ensures you never miss a beat on indoor/outdoor climate.
DUAL ENVIRONMENT MONITORING - Remote probe delivers precise outdoor readings alongside indoor data for real-time comparison.

The Extech 445713 Big Digit Hygro-Thermometer features a large LCD display showing indoor and outdoor temperature and humidity with ±5% RH and ±1.8°F accuracy. Equipped with a remote probe and Min/Max memory, it tracks climate trends effortlessly. Designed for versatile mounting and powered by a single AAA battery, it delivers fast, reliable readings ideal for homes, offices, and controlled environments.

Specifications

ASIN	B000WTH3NQ
Additional Features	Alarm
Age Range Description	Adult
Best Sellers Rank	#473,911 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #732 in Weather Thermometers
Brand Name	Extech
Color	green/white
Connectivity Technology	Wired
Customer Reviews	4.2 4.2 out of 5 stars (85)
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
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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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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