About Hearing Protection
Earmuffs and earplugs are rated by the Noise Reduction Rating (NRR) guidelines, which are enforced by OSHA.
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Sound Level Testers
Take readings of ambient sound levels. These portable testers give you spot readings, so you can monitor workplace machinery and vehicles, comply with safety regulations, and adhere to noise ordinances.
Testers have a selectable frequency weighting—an electronic filter that adjusts the way the tester measures sound. The A weighting is similar to the response of the human ear and is used by OSHA. The C weighting is suitable for measuring the sound level of machinery.
Testers with NIST certification include a calibration certificate traceable to NIST.
Testers with a backlit display can be read in dim areas.
Testers with an SD card store timestamped readings in Excel format for easy data logging and PC transfer. The SD card stores up to 20 million readings.
Use the calibrator (sold separately) to calibrate the tester before each use and verify that it is working properly.

| Measuring Range, dBA | Sound Frequency Weighting | Accuracy, dB | Data Connection Type | Ht. | Wd. | Dp. | Batteries Included | Features | Includes | Specs. Met | Each | ||
Testers | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 40-130 | A, C | ±2.0 | __ | 9" | 2 1/4" | 1 3/4" | Yes | __ | __ | __ | 00000000 | 000000 |
| 2 | 35-130 | A, C | ±1.0 | __ | 6" | 1 1/4" | 1 1/4" | Yes | Backlit Display, Wrist Strap | Windscreen | ANSI S1.4 Type 2 | 00000000 | 000000 |
| 2 | 35-130 | A, C | ±1.5 | 3.5 mm Audio | 10" | 3" | 1 1/2" | Yes | Backlit Display | Storage Case | ANSI S1.4 Type 2 | 00000000 | 000000 |
| 3 | 30-130 | A, C | ±1.4 | 3.5 mm Audio, Standard SD Card | 9" | 2 1/4" | 1 1/4" | Yes | Backlit Display | 1 GB SD Card, Storage Case, Windscreen | ANSI S1.4 Type 2 | 00000000 | 000000 |
Testers with NIST Certificate | |||||||||||||
| 1 | 40-130 | A, C | ±2.0 | __ | 9" | 2 1/4" | 1 3/4" | Yes | __ | __ | __ | 00000000 | 000000 |
| 2 | 35-130 | A, C | ±1.5 | 3.5 mm Audio | 10" | 3" | 1 1/2" | Yes | Backlit Display | Storage Case | ANSI S1.4 Type 2 | 0000000 | 000000 |

Kits include a tester, calibrator, and calibration screwdriver to help calibrate your tester before every use.
| Measuring Range, dBA | Sound Frequency Weighting | Accuracy, dB | Ht. | Wd. | Dp. | Batteries Included | Features | Includes | Specs. Met | Each | |
Kits | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 35-130 | A,C | ±1.5 | 8" | 2 1/4" | 1 1/4" | Yes | Backlit Display | Calibrator, Screwdriver, Storage Case, Windscreen | ANSI S1.4 Type 2 | 00000000 | 0000000 |
Kits with NIST Certificate | |||||||||||
| 35-130 | A,C | ±1.5 | 8" | 2 1/4" | 1 1/4" | Yes | Backlit Display | Calibrator, Screwdriver, Storage Case, Windscreen | ANSI S1.4 Type 2 | 00000000 | 000000 |

Make sure your sound level monitor or tester provides reliable readings. These calibrators have a small speaker that generates sound at precise levels, so your monitor can be accurately calibrated before each use.
Sound | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Microphone Dia. | Frequency, Hz | Frequency Accuracy | Volume, dB | Volume Accuracy, dB | Dia. | Lg. | Mount Type | Batteries Included | Includes | Each | |
| 1/2", 1" | 1,000 | ±5% | 94 | ±0.5 | 2 1/8" | 5 5/8" | Portable | Yes | Screwdriver, Storage Case | 00000000 | 0000000 |
Sound Level Monitors
Continuously measure ambient sound levels. The display alerts you when levels either exceed or fall below your programmed thresholds. When operating the monitor with the included 120V AC adapter, four warning lights will also flash when a threshold is reached. Monitors have a microphone that rotates 180°. They can be surface mounted or propped up using the attached folding stand. These monitors cannot be sold to Canada due to import regulations.
You can select the frequency weighting—an electronic filter that adjusts the way the monitor measures sound. The A weighting is similar to the response of the human ear and is used by OSHA. The C weighting is suitable for measuring the sound level of machinery.
Use a calibrator (sold separately) to calibrate the monitor on a regular basis and verify that it is working properly.

| Measuring Range, dB | Sound Frequency Weighting | Fasteners Included | Mounting Hole Dia. | Power Source | Electrical Connection | Batteries Included | Number of Batteries Required | Battery Size | Specifications Met | Cannot Be Sold To | Each | |
Monitors | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 30-130 | A, C | No | 1/2" | Battery, Electric | Plug In | No | 8 | AA | ANSI S1.4 | Canada | 0000000 | 0000000 |
Monitors With NIST Certificate | ||||||||||||
| 30-130 | A, C | No | 1/2" | Battery, Electric | Plug In | No | 8 | AA | ANSI S1.4 | Canada | 0000000 | 000000 |
Make sure your sound level monitor or tester provides reliable readings. These calibrators have a small speaker that generates sound at precise levels, so your monitor can be accurately calibrated before each use.
Sound | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Microphone Dia. | Frequency, Hz | Frequency Accuracy | Volume, dB | Volume Accuracy, dB | Dia. | Lg. | Mount Type | Batteries Included | Includes | Each | |
| 1/2", 1" | 1,000 | ±5% | 94 | ±0.5 | 2 1/8" | 5 5/8" | Portable | Yes | Screwdriver, Storage Case | 00000000 | 0000000 |
Personal Sound Exposure Monitors
Clip these monitors on to measure your noise exposure. Also known as personal noise dosimeters, they continuously measure ambient sound levels, intensity, and duration. You’ll often see them used in factories, airports, and construction sites to help comply with OSHA regulations for noise exposure. These monitors give noise dose as a percentage of the maximum safe daily limit and alert you when levels are outside your set threshold. You can choose from preprogrammed sound level tests or program your own. Set the monitor to record automatically or program it to record samples at timed intervals.
An electronic filter adjusts the way these testers measure sound, so you can choose the frequency weighting you need. The A weighting mimics the human ear’s response to sound. It is used by OSHA to measure the risk of potential hearing damage. The C weighting measures low-frequency sounds, so it’s often used to measure the sound level of machinery. The Z weighting gives you a flat frequency response and represents the actual noise without any adjustments.
Transmit readings to your PC with the included cord. The included software lets you review stored sound measurements and analyze measurements in real time.
Use a calibrator (sold separately) before and after each use to keep monitors accurate and maintain compliance with ANSI standards.

| Measuring Range, dBA | Sound Frequency Weighting | Mount Type | Accuracy, dB | Data Connection Type | Ht. | Wd. | Dp. | Batteries Included | Includes | Sound Level Tests | Each | |
| 30-140 | A, C, Z | Portable | ±1.4 | Mini USB-B | 4" | 2 1/4" | 1 1/4" | Yes | 1/2" Clip-On Microphone, 32" Lg Microphone Cord, 6 ft. Long USB Cord, Belt Clip, Storage Case, Windows Compatible Software, Windscreen | ACGIH Threshold Limit Values for Physical Agents, DOD Instruction 4715.13, ISO 9612, MSHA Compliant 30 CFR 62.170, OSHA Compliant 29 CFR 1910.95 | 0000000 | 0000000 |

Make sure your sound level monitor or tester provides reliable readings. These calibrators have a small speaker that generates sound at precise levels, so your monitor can be accurately calibrated before each use.
Sound | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Microphone Dia. | Frequency, Hz | Frequency Accuracy | Volume, dB | Volume Accuracy, dB | Dia. | Lg. | Mount Type | Batteries Included | Includes | Each | |
| 1/2", 1" | 1,000 | ±5% | 94 | ±0.5 | 2 1/8" | 5 5/8" | Portable | Yes | Screwdriver, Storage Case | 00000000 | 0000000 |
Large-Display Sound Level Monitors
Mount these monitors to your wall to view the sound level of your plant from 100 feet away. This helps you continuously keep an eye on the amount of noise in your work environment to make sure it’s safe. When the sound level exceeds your programmed threshold, the numbers on these monitors will turn from green to red. The A weighting is similar to the response of the human ear and is used by OSHA.
Attach them with the mounting holes on the back. The included cord lets you transmit data to your computer.

Mounting Hole | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Measuring Range, dB | Sound Frequency Weighting | Accuracy, dBA | Data Connection Type | Character Ht. | Mount Type | Fasteners Included | Dia. | No. of | Power Source | Voltage | Plug Type | Cord Lg., ft. | Specifications Met | Each | |
| 30-130 | A | ±1.5 | Micro USB-B | 3" | Surface | No | 1/4" | 4 | Electric | 5V DC | USB-A | 2 1/2 | CE Marked | 0000000 | 0000000 |

Make sure your sound level monitor or tester provides reliable readings. These calibrators have a small speaker that generates sound at precise levels, so your monitor can be accurately calibrated before each use.
Sound | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Microphone Dia. | Frequency, Hz | Frequency Accuracy | Volume, dB | Volume Accuracy, dB | Dia. | Lg. | Mount Type | Batteries Included | Includes | Each | |
| 1/2", 1" | 1,000 | ±5% | 94 | ±0.5 | 2 1/8" | 5 5/8" | Portable | Yes | Screwdriver, Storage Case | 00000000 | 0000000 |
Calibrators for Sound Level Monitors

Make sure your sound level monitor or tester provides reliable readings. These calibrators have a small speaker that generates sound at precise levels, so your monitor can be accurately calibrated before each use.
Sound | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Microphone Dia. | Frequency, Hz | Frequency Accuracy | Volume, dB | Volume Accuracy, dB | Dia. | Lg. | Mount Type | Batteries Included | Includes | Each | |
| 1/2", 1" | 1,000 | ±5% | 94 | ±0.5 | 2 1/8" | 5 5/8" | Portable | Yes | Screwdriver, Storage Case | 00000000 | 0000000 |
Hearing Protection Fit Testing Systems

In a matter of minutes, confirm your earplugs deliver the right level of hearing protection. These kits help you meet OSHA standards for protection from excessive noise. Conduct the test onsite—everything you need, including a tablet with software already installed, is included. To use this kit, you will undergo a hearing test with and without your earplugs to determine the lowest volume you can hear. The system then calculates the difference between the scores and produces a personal attenuation rating (PAR).
Once the test is complete, you’ll receive a full report to help you choose the best earplugs. The results automatically upload to cloud storage and can be accessed on multiple devices.
Ear Cup | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Measuring Range, dB | Accuracy, dB | Frequency Range, Hz | Connection Type | Range, ft. | Material | Color | Ear Cushion Material | Headband Material | Batteries Included | Sound Level Tests | Includes | Software Included | Each | |
Over Head Fit | ||||||||||||||
Dual Output | ||||||||||||||
| 0-100 | ±3 | 200-800 | Bluetooth | 160 | Plastic | Black | Foam | Plastic | Yes | OSHA Compliant 29 CFR 1910.95 | Headphones, Tablet, Cloud Storage, Carrying Case | Yes | 00000000 | 000000000 |
Stethoscopes



Listen to machine performance to detect mechanical problems and leaks.
Stethoscopes with a funnel probe are good for detecting noise from vacuum, air, and exhaust leaks.
Stethoscopes with a magnetic probe attachment can be used hands-free.
Noise-Filtering Stethoscopes with Microphone Clamps




Attach microphones to different spots on running machines or vehicles to amplify squeaks, knocking, and rattling from worn parts. To help you isolate sounds, these stethoscopes come with headphones that reduce background noise.
Stethoscopes with a dial control connect to six microphone clamps with color-coded wire leads. Turn the dial to listen to each one in turn, so you can pinpoint the source of a sound.
Stethoscopes with a touch screen control let you select and mute each microphone on a bright LCD screen. They include both color-coded wireless transmitters and microphone clamps—you can mount them separately to listen in on hard-to-reach spots.
Probe | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Headphones Type | Microphone Type | No. of Microphones Included | Lg. | Type | Flexibility | Control Type | Batteries Included | Includes | Container Type | Each | |
Stethoscopes | |||||||||||
| Earbud | Corded | 1 | 6" | Sensor | Flexible | __ | Yes | 5" Rigid Probe Extension | Vinyl Pouch | 0000000 | 000000 |
Stethoscopes with Dial Control | |||||||||||
| Earmuff | Corded | 6 | __ | __ | __ | Dial | Yes | Clamp Storage Pouch | Plastic Carrying Case | 0000000 | 000000 |
Stethoscopes with Touch Screen Control | |||||||||||
| Earmuff | Wireless | 4 | __ | __ | __ | Touch Screen | Yes | Transmitter Charging Station, USB Charging Cord (6 ft.), 4 Transmitter Extension Cords (3 ft.) | Canvas Bag | 0000000 | 000000 |
Noise-Filtering Stethoscopes
Isolate individual sounds during inspections. These stethoscopes amplify internal sounds so they’re loud enough to hear, while the included set of headphones filters out background noise for clarity. They’re often used to detect mechanical problems and leaks. Reach the included probe into the area you’re inspecting for precise listening. All include either multiple probes or a probe extension for hard-to-reach areas.
Dial display stethoscopes are commonly used in vehicles to help identify issues such as worn bearings, broken gear teeth, and wind and air leaks. Set their sensitivity to match your environment using the high/low switch. High sensitivity will better detect quiet sounds but might be too reactive in loud environments. Low sensitivity is a better choice for noisy environments, since loud sounds can damage your hearing when further amplified.
Digital display stethoscopes are an upgrade from those with a dial display. Designed for sophisticated machinery, they’re often used to inspect precision bearings. A user-friendly screen makes it easy to operate these stethoscopes with no special training. Volume levels are displayed both in digits and graphs so you can accurately compare across multiple measurements. An output jack lets you connect a recording device to document sounds, so you can play back noises to track progress and confirm issues are resolved. They come with recorded example noises to teach you the sounds of both functioning parts and specific problems—a damaged outer ring, for example—so you can pinpoint issues before opening your equipment.

Probe | ||||||||
|---|---|---|---|---|---|---|---|---|
| Measuring Range | No. of Probes Included | Lg. | Flexibility | Batteries Included | Container Type | Features | Each | |
| 30 Hz-15 kHz | 2 | 2 3/4", 11 3/4" | Rigid | Yes | Plastic Carrying Case | Auto Shut-Off, Mute Button | 000000000 | 000000000 |


























