---
product_id: 2175292
title: "445580 Humidity and Temperature Pen, Fast Sensor, Dual LCD | Fast-response sensor, MIN/MAX memory, pocket hygrometer, HVAC/labs/storage, indoor air monitoring"
brand: "extech"
price: "€ 172.37"
currency: EUR
in_stock: true
reviews_count: 13
url: https://www.desertcart.fi/products/2175292-445580-humidity-and-temperature-pen-fast-sensor-dual-lcd-fast
store_origin: FI
region: Finland
---

# sub-second sensor response dual LCD for simultaneous readout compact pen-style design 445580 Humidity and Temperature Pen, Fast Sensor, Dual LCD | Fast-response sensor, MIN/MAX memory, pocket hygrometer, HVAC/labs/storage, indoor air monitoring

**Brand:** extech
**Price:** € 172.37
**Availability:** ✅ In Stock

## Summary

> 🌡️ Measure Fast, Work Smart — Stay Ahead of the Climate Curve!

## Quick Answers

- **What is this?** 445580 Humidity and Temperature Pen, Fast Sensor, Dual LCD | Fast-response sensor, MIN/MAX memory, pocket hygrometer, HVAC/labs/storage, indoor air monitoring by extech
- **How much does it cost?** € 172.37 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/2175292-445580-humidity-and-temperature-pen-fast-sensor-dual-lcd-fast)

## Best For

- extech enthusiasts

## Why This Product

- Trusted extech brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Dual LCD Clarity:** Simultaneously view humidity and temperature on a bright, easy-to-read display—efficiency at a glance.
- • **Min/Max Memory Tracking:** Capture environmental fluctuations over time to troubleshoot and validate conditions like a pro.
- • **Pocket-Ready Portability:** Slim, lightweight pen design fits effortlessly in your toolkit or pocket for on-the-go monitoring.
- • **Instant Precision Readings:** Fast, reliable humidity & temperature data in seconds—no waiting, no guessing.
- • **Versatile Environmental Control:** Perfect for HVAC, labs, greenhouses, and sensitive storage—maintain optimal air quality with confidence.

## Overview

The Extech 445580 Humidity and Temperature Pen is a professional-grade, pocket-sized meter delivering fast, accurate indoor environmental readings. Featuring a responsive sensor with sub-second updates, a dual LCD display for simultaneous humidity and temperature monitoring, and min/max memory for trend tracking, it’s engineered for HVAC pros, inspectors, and facility managers. Its compact, durable design ensures portability and reliability for air quality assessments, storage audits, and environmental control across diverse settings.

## Description

The Extech 445580 Humidity/Temperature Pen is a compact, high-precision tool designed for fast and reliable indoor environmental monitoring. Engineered for HVAC professionals, inspectors, facility managers, and lab technicians, this pocket-sized meter provides instant readings of both humidity and temperature on a clear dual LCD display. Its responsive sensor ensures accurate real-time results, while the built-in min/max memory helps track fluctuations and verify long-term conditions. Lightweight and easy to carry, the 445580 is ideal for air quality assessments, comfort studies, storage verification, greenhouse monitoring, and workplace inspections. Whether you're validating HVAC performance or ensuring proper environmental control for sensitive materials, this dependable meter delivers professional-grade results in a portable, user-friendly design.

Review: A Gem in a Field of Cheap Toys - I want to preface this review with the caveat that in order to achieve accurate relative humidity readings, this psychrometer will require the use of a 33% and 75% calibration salt kit. While they cost as much as this meter, they at least ensure accuracy, which was NOT achieved through factory calibration. As shown in the review image, the RH% reading is not calibrated we'll out of the box, but that can be expected as calibration can change in storage or shipping. I went through and returned several other psychrometers on desertcart before finally finding this one, which actually worked as described. The entire market is saturated with cheap Chinese clones where a company (sometimes reputable) slaps their name on, or changes the color of, the same generic Chinese psychrometer (often 12 degrees F or more off and unable to be calibrated). This meter, however, is unique in on the market and has the backing of the company that produced it. The calibration procedure with the Extech salt kit is easy. The meter is perfectly sized to fit within their calibration bottles and the directions are clear on how to calibrate both to 33% and 75% relative humidity. The construction of the meter exceed that of the competition as well. While It is still plastic, that plastic feels thicker and more solid than the other models on the market which feel like cheap toys. The meter reacts very quickly to changes in temperature and humidity, possibly sub-second, but does take a good 20 seconds or so to stabilize in a new environment. My goal for the meter was to establish as accurate a baseline reading for Temperature and Relative Humidity as possible for use in calibration many other sensors of varying makes and brands within my home automation system and I can gladly report that the goal has been achieved through this meter.
Review: Great temp/humidity pen! - This is a a great device, I work for a mold remediation company and this is essential to our inspections. We get the temp and humidity reading within just a few seconds of turning it on and use the data between indoors and out to determine if there is a water intrusion issue. I does take about 10 seconds after turning on to deliver an accurate reading and is also best if not held in your hand when being used as it will cause a slight variance in the result.

## Features

- FAST HUMIDITY AND TEMPERATURE READINGS – Get quick, reliable measurements with a responsive sensor designed for on-the-spot indoor monitoring, making it perfect for HVAC checks, lab work, storage audits, and facility inspections.
- COMPACT AND TRAVEL-READY DESIGN – Slim, pen-style housing fits easily in a pocket, tool pouch, or bag, giving technicians and inspectors a convenient, portable meter they can carry anywhere for instant environmental checks.
- CLEAR DUAL LCD DISPLAY – Features a bright, easy-to-read dual display showing humidity and temperature at the same time, helping users confirm environmental conditions instantly without switching modes or wasting time.
- MIN/MAX MEMORY FUNCTION – Tracks minimum and maximum humidity and temperature levels, allowing you to identify trends, troubleshoot indoor air issues, and verify conditions over time during inspections or monitoring routines.
- IDEAL FOR AIR QUALITY AND STORAGE CONTROL – Perfect for maintaining proper environmental conditions in offices, greenhouses, labs, warehouses, and sensitive storage areas where stable humidity and temperature are crucial.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00023RVR0 |
| Battery Description | Alkaline |
| Best Sellers Rank | #201,890 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #30 in Humidifier Humidity Meters #183 in Humidifier Accessories |
| Brand | Extech |
| Brand Name | Extech |
| Color | green |
| Customer Reviews | 4.6 out of 5 stars 239 Reviews |
| Global Trade Identification Number | 00793950455807 |
| Included Components | 445580, pocket clip, 2023 button battery |
| Item Dimensions W x H | 1.2"W x 1"H |
| Item Weight | 0.07 kg |
| Lower Temperature Rating | 14 °F |
| LowerTemperature Range | 14 °F |
| Manufacturer | Extech |
| Model | 445580 |
| Mounting Type | Tabletop |
| Number of Items | 1 |
| Operating Humidity | 5% - 95% relative humidity |
| Part Number | 445580 |
| Product Dimensions | 1.2"W x 1"H |
| Temperature Accuracy | 1 degree Celsius |
| Temperature Reading Accuracy | plus_minus_1_point_8_degrees_celsius |
| UPC | 793950455807 013227082940 799891859544 885117593696 705554395052 013161017268 |
| Unit Count | 1 Count |
| Upper Temperature Range | 122 °F |
| Voltage | 3 volts |
| Warranty Description | 1 year |

## Product Details

- **Battery Description:** Alkaline
- **Brand:** Extech
- **Color:** green
- **Item Weight:** 0.07 kg
- **Product Dimensions:** 1.2"W x 1"H

## Images

![445580 Humidity and Temperature Pen, Fast Sensor, Dual LCD | Fast-response sensor, MIN/MAX memory, pocket hygrometer, HVAC/labs/storage, indoor air monitoring - Image 1](https://m.media-amazon.com/images/I/71IN4BwC-6L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ A Gem in a Field of Cheap Toys
*by M***H on August 10, 2023*

I want to preface this review with the caveat that in order to achieve accurate relative humidity readings, this psychrometer will require the use of a 33% and 75% calibration salt kit. While they cost as much as this meter, they at least ensure accuracy, which was NOT achieved through factory calibration. As shown in the review image, the RH% reading is not calibrated we'll out of the box, but that can be expected as calibration can change in storage or shipping. I went through and returned several other psychrometers on Amazon before finally finding this one, which actually worked as described. The entire market is saturated with cheap Chinese clones where a company (sometimes reputable) slaps their name on, or changes the color of, the same generic Chinese psychrometer (often 12 degrees F or more off and unable to be calibrated). This meter, however, is unique in on the market and has the backing of the company that produced it. The calibration procedure with the Extech salt kit is easy. The meter is perfectly sized to fit within their calibration bottles and the directions are clear on how to calibrate both to 33% and 75% relative humidity. The construction of the meter exceed that of the competition as well. While It is still plastic, that plastic feels thicker and more solid than the other models on the market which feel like cheap toys. The meter reacts very quickly to changes in temperature and humidity, possibly sub-second, but does take a good 20 seconds or so to stabilize in a new environment. My goal for the meter was to establish as accurate a baseline reading for Temperature and Relative Humidity as possible for use in calibration many other sensors of varying makes and brands within my home automation system and I can gladly report that the goal has been achieved through this meter.

### ⭐⭐⭐⭐⭐ Great temp/humidity pen!
*by D***D on November 29, 2016*

This is a a great device, I work for a mold remediation company and this is essential to our inspections. We get the temp and humidity reading within just a few seconds of turning it on and use the data between indoors and out to determine if there is a water intrusion issue. I does take about 10 seconds after turning on to deliver an accurate reading and is also best if not held in your hand when being used as it will cause a slight variance in the result.

### ⭐⭐⭐⭐⭐ YEP, THIS ONE WORKS!
*by T***1 on June 8, 2025*

Works as it should. Just as accurate as more expensive products

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-09-01*