# Extech SD800 CO2/Humidity/Temperature Datalogger

# Extech SD800 CO2/Humidity/Temperature Datalogger

## Key Features At A Glance

-   Maintenance-free dual-wavelength NDIR (non-dispersive infrared) CO2 sensor
-   Triple LCD simultaneously displays CO2, temperature, and relative humidity
-   CO2 measurement range of 0 to 4,000 ppm with 1 ppm maximum resolution
-   Logs readings to SD card in Excel format with date/time stamp for easy PC transfer
-   Selectable sampling rate: 5, 10, 30, 60, 120, 300, 600 seconds or Auto
-   Temperature range 32 to 122°F (0 to 50°C); humidity range 10 to 90%RH
-   Ships with sensor on 11.4" (29 cm) cable, six AAA batteries, SD card, universal AC adaptor, and mounting bracket

The Extech SD800 is a multifunction air quality datalogger that measures Carbon Dioxide (CO2), relative humidity, and temperature on a single instrument. It records all three parameters onto an SD card in Excel format with a date and time stamp, allowing readings to be transferred to a PC for data analysis. A triple LCD shows CO2, temperature, and relative humidity simultaneously, and the CO2 reading is taken with a maintenance-free dual-wavelength NDIR (non-dispersive infrared) sensor.

The SD800 is intended for monitoring air quality in schools, office buildings, greenhouses, hospitals, and anywhere that high levels of carbon dioxide are generated. In each of these environments the instrument tracks CO2 concentration alongside temperature and humidity, building a time-stamped record that supports later review of how conditions changed over a logging period.

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 operates as part of FLIR Systems, Inc., which holds the copyright on this product's documentation.

## Accessories Supplied

-   Sensor with 11.4" (29cm) cable
-   (6) AAA batteries
-   SD memory card
-   Universal AC adaptor
-   Mounting bracket

## Product Core & Specifications

Specification

Value

Carbon Dioxide (CO2)

Range

0 to 4,000ppm

Max Resolution

1ppm

Basic Accuracy

±40ppm (<1000ppm); ±5% rdg (>1000ppm)

Temperature

Range

32 to 122°F (0 to 50°C)

Max Resolution

0.1°F/°C

Basic Accuracy

±1.8°F/0.8°C

Humidity

Range

10 to 90%RH

Max Resolution

0.1%RH

Basic Accuracy

±4%RH

General

CO2 Sensor

Maintenance free dual wavelength NDIR (non-dispersive infrared)

Display

Triple LCD simultaneously displays CO2, Temperature and Relative Humidity

Datalogging

using included SD memory card (Excel format with date and time stamp)

Selectable Data Sampling Rate

5, 10, 30, 60, 120, 300, 600 seconds or Auto

Dimensions

5.2 x 3.1 x 1.3" (132 x 80 x 32mm)

Weight

9.9oz (282g)

> **Important:** AC adaptor required for operation.

## 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:** 509.0 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 | 509.00 USD | In stock |

## Images

- SD800 Extech Data Logger

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> Source: [ValueTronics](https://valuetronics.com/products/sd800-extech-data-logger-new)
> Updated: 2026-06-20