# Extech RHT20 Humidity and Temperature USB Datalogger

# Extech RHT20 Humidity and Temperature USB Datalogger

## Key Features At A Glance

-   USB interface for easy setup and data download
-   Selectable data sampling rate from 1 second to 24 hours
-   User-programmable alarm thresholds for humidity and temperature
-   LCD displays current readings, Min/Max, and alarm status
-   Records up to 16,000 humidity and 16,000 temperature readings
-   Temperature range -40 to 158°F (-40 to 70°C); humidity 0 to 100%RH
-   Ships with 3.6V lithium battery, mounting bracket with combination lock, and Windows analysis software

The Extech RHT20 is a USB humidity and temperature datalogger that records relative humidity and temperature over time and connects directly to a computer for data analysis. An onboard LCD shows current readings, Min/Max values, and alarm status, while the USB connector plugs into a computer to download and review logged temperature and humidity data.

The RHT20 is built to monitor humidity and temperature levels in warehouses, storage rooms, freezers, shipping vans, and offices. Its USB connector plugs easily into a computer so logged temperature and humidity data can be analyzed after a monitoring run.

ValueTronics stocks and holds its own inventory in a 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois.

## Brand Heritage

Extech Instruments was acquired by FLIR Systems in 2007 and operates as a FLIR brand.

## Accessories Supplied

-   3.6V Lithium battery
-   Mounting bracket with combination lock
-   Windows 2000, XP, Vista, and 7 compatible analysis software

## Product Core & Specifications

Specification

Value

Temperature

Range

\-40 to 158°F (-40 to 70°C)

Resolution

0.1°F/°C

Accuracy (°F)

±1.8°F (14 to 104°F); ±3.6°F (all other ranges)

Accuracy (°C)

±1.0°C (-10 to 40°C); ±2.0°C (all other ranges)

Humidity

Range

0 to 100%RH

Resolution

0.1%RH

Accuracy

±3%RH (40 to 60%); ±3.5%RH (20 to 40 & 60 to 80%); ±5%RH (0 to 20 & 80 to 100%)

General

Datalogging interval

1 second to 24 hours

Memory

Temperature: 16,000 points; Relative Humidity: 16,000 points

Dimensions

3.7 x 1.9 x 1.2" (94.4 x 48.9 x 31.2mm)

Weight

3.2oz (90.7g)

## About this New unit

This is a brand-new, factory-sealed unit, supplied exactly as it arrives from the manufacturer and backed by the full manufacturer warranty. For the exact configuration, available options, included accessories, or current lead time for your application, our Test Architects can confirm the details before you order.

ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.

**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:** 184.0 USD
- **Vendor:** Extech
- **Type:** Data Log
- **Tags:** Data Logger, Extech, Manufacturers, Meters & DAQ, product_manual_group_2, Product_new

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 184.00 USD | In stock |

## Images

- RHT20 Extech Data Logger

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> Source: [ValueTronics](https://valuetronics.com/products/rht20-extech-data-logger-new)
> Updated: 2026-06-20