The Serrax SLM121 Sound Level Meter is a high-performance instrument designed to measure and analyze sound levels accurately in industrial, environmental, and workplace settings. Built for professionals who demand precision, it ensures reliable noise monitoring with a user-friendly interface and advanced functionality. Equipped with parameters like SPL, LEQ, Lmax, Lmin, L10, L50, L90, and Location ID, this meter captures every sound variation with accuracy and detail. With a measurement range of 30–130 dB and 0.1 dB resolution, the SLM121 is ideal for both environmental noise assessments and occupational sound studies. Its auto range selection, ‘A’ frequency weighting, and FAST/SLOW time weighting modes allow flexible and accurate data capture under varying noise conditions. The device features a graphics LCD display for clear visualization and a user-selectable logging interval (1–60 minutes) to suit diverse monitoring needs. With internal data storage for months, it eliminates the need for frequent data transfers and ensures seamless long-term noise analysis. Key Features: ✔ Measurement Range: 30–130 dB ✔ Resolution: 0.1 dB ✔ Parameters: SPL, LEQ, Lmax, Lmin, L10, L50, L90, Location ID ✔ Frequency Weighting: ‘A’ type ✔ Time Weighting: SLOW, FAST ✔ Display: Graphics LCD ✔ Data Logging Interval: 1–60 minutes ✔ Internal Data Storage: For long-term use Whether you’re monitoring industrial noise, conducting environmental surveys, or ensuring compliance with noise regulations, the Serrax SLM121 Sound Level Meter delivers unmatched accuracy, reliability, and performance — making it a trusted choice for professionals across sectors.

1. SERRAX SML121 SOUND
LEVEL METER
HOW TO USE

2. Monitoring sound levels is essential in
industries, workplaces, and even
residential spaces to ensure compliance
with noise regulations and protect
human health.
The Serrax SLM121 Sound Level Meter is
designed to make this process simple,
accurate, and reliable. Here s a Step-by-
Step guide on how to use it effectively.

3. THE SLM121 COMES
WITH A GREEN ON
BUTTON THAT STARTS
THE DEVICE
INSTENTLY. PRESS IT
ONCE, AND THE
METER WILL
ACTIVATE, SHOWING
REAL - TIME READINGS
ON ITS GRAPHIC
DISPLAY.
Microphone
Graphic Display
Off On

4. THIS MAKES IT EASY FOR USERS TO MONITOR BOTH INSTANT AND LONG-
TERM NOISE EXPOSURE.
1 2 3
SPL (Sound Pressure Level) in
decibels (DB)
Leq (Equivalent Continuous
Sound Level)
Minimum and Maximum
recorded values
4
Additional acoustic
Parameters for detailed
analysis

5. POSITION THE DEVICE
Hold the meter upright with the microphone facing
the sound source. the built-in microphone captures
sound waves and converts them into accurate
electrical signals, ensuring precise readings.

6. MEASURE SOUND LEVEL
The SLM121 Covers a wide range of 30dB,
making it suitable for quiet environments like
offices as well as noisy ones like factories or
construction sites.

7. USE ADDITIONAL FUNCTIONS
Data Logging : Record and store
sound level readings for latter
analysis.
Built-in Alarm : Get alerts when
noise exceeds a predefined
threshold.
Location ID : Assign unique IDs to different
measurement sites for organized reporting
and comparison.

8. POWER OFF
AFTER USE
Once Your measurments are
complete, press the red OFF
button. the device is
compact and Portable, so
You can easily carry it to your
nest location.
Pro Tip: For best results, avoid
blocking the microphone and
always take readings at ear-
level to simulate real human
exposure.

9. WHY CHOOSE SRRAX SLM121?
With its accuracy, portability, and smart featurres
like data logging and alarms, the SLM121 is more
than just a sound level meter its a complete noise
monitoring solution for industries, lab, and
enviromental studies.
Whether you’re ensuring workplace compliance, monitoring urban noise, or
controlling sound in event venues, the Serrax SLM121 is designed to make noise
measurment simple and relible.

10. THANK YOU
VISIT US
info@serrax.in
+918851906679 www.serrax.in