# Extech SL400 Personal Noise Dosimeter

# Extech SL400 Personal Noise Dosimeter

## Key Features At A Glance

-   Measures frequency-weighted noise exposure and peak (C, Z) sound level for OSHA/IEC accumulation surveys
-   Datalogs up to 999,999 readings in sound level meter mode, with sampling times from 1 second to 24 hours
-   Frequency weighting A, C, Z with Fast, Slow, and Impulse response rates; 20 Hz to 8 kHz bandwidth
-   Adjustable Criterion Level and Threshold (30 to 140 dB in 0.1 dB steps) and Exchange Rate of 3, 4, 5, or 6 dB
-   USB interface with Windows 7/8 software to set up, retrieve stored events, or analyze real-time measurements
-   Optional 94 dB calibrator for before and after calibration checks per ANSI standards
-   Ships complete with clip-on 0.5" microphone, windscreen, belt clip, 9V battery, USB cable, software, and case

The Extech SL400 is a compact, lightweight personal noise dosimeter with a USB interface, designed to test noise exposure and provide noise surveys for compliance with OSHA, MSHA, DOD, ACGIH, and ISO standards. It measures frequency-weighted noise exposure and peak (C, Z) sound level, and includes PC software to control setup and retrieve stored events or analyze real-time measurements.

For employees who are exposed to loud noise, sound level monitoring is essential to determine what protective measures are required. Worn on the body, the SL400 performs OSHA and IEC noise accumulation surveys to determine total sound exposure over an 8-hour period. Listed applications include personal accumulated noise exposure measurement, workplace noise assessment, and OSHA and other regulatory agency compliance.

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

## Brand Heritage

Extech Instruments became part of FLIR Systems in 2007, and FLIR Systems was subsequently acquired by Teledyne Technologies in 2021.

## Accessories Supplied

-   Belt clip
-   Clip-on 0.5" (12.7 mm) microphone with 32" (81.3 cm) cable and windscreen
-   9V battery
-   Software
-   USB cable
-   Carrying case

## Product Core & Specifications

Specification

Value

Standards

IEC61252-1993, IEC67672-1-2003, ANSI S1.25-1992, ANSI S1.4-1983, ANSI S1.43-1997

Ranges (Accuracy)

30 to 90 dB, 50 to 110 dB; C, Z Peak: 70 to 140 dB / C and Z Peak: 90 to 143 dB (Accuracy: ±1.4 dB @ 94 dB 1 kHz)

Frequency Weighting

A, C, Z

Response Rate

Fast, Slow, Impulse

Bandwidth

20 Hz to 8 kHz

Memory

Dose: 10,000 points / SLM: 999,999 points

Criterion Level / Threshold Level

30 to 140 dB in 0.1 dB steps / 30 to 140 dB in 0.1 dB steps

Exchange Rate

3, 4, 5 or 6 dB

Measurement Duration

5, 10, 15, or 30 minutes; 1, 2, 4, 8, 10, 12, or 24 hours

Measurement Modes

%Dose, Lxmax, Lxyp, Lxmin, Lxeq, SEL (LAE), PeakMAX, LAVG, TWA, LEP, LN%; SPL, Lxmax, Lxyp, Lxmin, Lxeq, SEL (LAE), PeakMAX

Dimensions

4.2 x 2.6 x 1.3 in. (107 x 65 x 33 mm) - excludes connector on top

Weight

7 oz. (198 g) including batteries and microphone cable

UPC Code

793950474006

> **Important:** Reference accuracy: ±1.4 dB at 94 dB, 1 kHz.

## 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:** 849.0 USD
- **Vendor:** Extech
- **Type:** Data Log
- **Tags:** Extech, Manufacturers, Meters & DAQ, product_manual_group_2, Product_new, Sound

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 849.00 USD | In stock |

## Images

- SL400 Extech Sound Meter

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> Source: [ValueTronics](https://valuetronics.com/products/sl400-extech-sound-meter-new)
> Updated: 2026-06-20