# Extech HD500 Psychrometer with Infrared Thermometer

# Extech HD500 Psychrometer with Infrared Thermometer

## Key Features At A Glance

-   3-in-1 combination meter: humidity, Type K thermocouple, and non-contact infrared thermometer in one handheld unit
-   Built-in infrared thermometer measures non-contact surface temperature from -58 to 932°F (-50 to 500°C) with 30:1 distance-to-target ratio
-   Type K thermocouple input for contact temperature measurement from -148 to 2501°F (-100 to 1372°C) with ±(1% + 1°C) accuracy
-   2% RH accuracy across the 0 to 100%RH measurement range
-   Calculates Dew Point (-90.4 to 140°F) and Wet Bulb (-6.88 to 140°F) from measured humidity and temperature
-   Heavy-duty double-molded housing with large triple LCD backlit display and built-in stand
-   USB port with included Windows-compatible PC software for data transfer and logging

The Extech HD500 is a handheld 3-in-1 combination meter that integrates a relative humidity sensor, a Type K thermocouple input, and a built-in non-contact infrared thermometer into a single instrument. Extech describes it as a Psychrometer with Infrared Thermometer, combining the functions of a humidity meter, a Type K thermometer, and an infrared surface temperature sensor in one heavy-duty handheld housing.

A psychrometer measures the moisture content of air, typically reporting relative humidity along with derived values such as dew point and wet-bulb temperature. The HD500 covers the full 0 to 100%RH range and computes dew point from -90.4 to 140°F and wet bulb from -6.88 to 140°F, alongside ambient air temperature from 14 to 140°F. The integrated infrared thermometer adds non-contact surface temperature measurement, and Extech positions this combination as well suited to home inspection applications where humidity, air temperature, and surface temperature all need to be checked together.

## Brand Heritage

Extech Instruments was founded in 1971 and became part of FLIR Systems in 2007, which is how the company is identified on this datasheet ('A FLIR Company'). FLIR Systems was itself acquired by Teledyne Technologies in 2021, placing the Extech product line within the broader Teledyne FLIR portfolio today.

## Accessories Supplied

-   Windows compatible software
-   USB cable
-   Type K bead wire temperature probe
-   Built-in stand
-   Hard carrying case
-   9V battery

## Product Core & Specifications

Specifications

Range

Basic Accuracy

InfraRed Thermometer

\-58 to 932°F (-50 to 500°C)

±2% or ±4°F/2°C

Distance to Target Ratio

30:1

—

Type K Temperature

\-148 to 2501°F (-100 to 1372°C)

±(1% + 1°C)

Air Temperature

14 to 140°F (-10 to 60°C)

±(2% ±4°F/2°C)

RH Range

0 to 100%RH

±2%RH

Dew Point

\-90.4 to 140°F (-68 to 60°C)

—

Wet Bulb

\-6.88 to 140°F (-21.6 to 60°C)

—

Dimensions

10 x 2.9 x 2" (255 x 75 x 50mm)

—

Weight

12.3oz (350g)

—

**Important:** Distance-to-target ratio for the infrared thermometer is 30:1. Maximum infrared measurement is 932°F (500°C); Type K contact measurement extends to 2501°F (1372°C).Recommended pairing: use the included Type K bead wire temperature probe for contact measurements that exceed the infrared channel's 932°F upper limit, up to the Type K input's 2501°F maximum.

**Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.**

## Details

- **Price:** 339.0 USD
- **Vendor:** Extech
- **Type:** Data Log
- **Tags:** Extech, Manufacturers, Meters & DAQ, product_manual_group_2, Product_new, Thermometer

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 339.00 USD | In stock |

## Images

- Extech HD500 Psychrometer with Infrared Thermometer

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> Source: [ValueTronics](https://valuetronics.com/products/hd500-extech-thermometer-new)
> Updated: 2026-05-30