The CR:308 and CR:310 are basic sound level meters that are perfect when you need simple noise information. Both meters are capable of measuring the maximum sound level (LMax) and the sound pressure level (SPL). Both the CR:308 and CR:310 are used for simple sound measuring applications, such as alarm testing, spot checks, and very basic occupational noise checks.

The Cirrus Research CR:308 and CR:310 sound level meters provide an entry level for noise measurement across multiple sectors, and meet current international standards for noise measurement instrumentation.

Both variants provide the sound pressure level (SPL) and maximum sound level (LMax) readings, which can help you determine how loud something/somewhere is without overcomplicating the data with other acoustic information. Both variations can also measure different frequency weightings, which provides more detailed and accurate data than many other basic sound level meters available on the market.

The CR:308 displays the SPL and LMax data, and comes with the ability to set your own noise level alert. Simply choose a decibel level, and when the meter records a noise level that meets or exceeds your pre-set value, a indicator will appear on the screen. This is incredibly useful when you need to know quickly and easily whether or not something is louder than a prescribed value.

The CR:310 can display the Leq for one measurement, using the start/stop button on the instrument. It can also send results directly to a portable printer, which is sold separately.

  • Simple to use
  • Clear, backlit LCD display
  • DC and AC out
  • Long battery life
  • Customisable noise level threshold alarm (308)
  • Leq view (310)
  • Print results directly to a portable printer (310)
  • Basic sound measuring applications
  • People who need a basic understanding of noise levels
  • Alarm installers
  • Simple noise testing
  • Machine and factory noise
  • Noise ordinance surveys
  • Fire alarm testing
  • Basic noise at work assessments

Applicable Standards:

IEC 61672-1:2013 Class 2

Measurement Range:

30dB (A) to 130dB (A)

40dB (C) to 130dB (C)

Frequency Weightings:

A and C

Time Weightings:

Fast (F) and Slow (S)

Display Functions:

Normal, Maximum, Minimum, C peak

Measurement Functions:


Leq (CR:310), LEq8h (CR:310)


< 25dB (A) and 35dB (C)

Display Flags

Threshold Limit, Overload, Under-range

Auto Calibration Range:


Reference Point:

94dB (1kHz), 92.9dB (8kHz)

Setting Time:



Backlit 128×64 LCD,resolution 0.1 dB.



Electrical Inputs:

5V power in via mini USB


2 x AA/LR6 1.5V batteries


5V DC via Mini USB

Battery Life:



½˝ pre-polarised electret condenser type HY:205

Operating Temperature:

0°C to +40°C

Operating Humidity:

25% to 90%

Atmospheric Pressure:

65 kPa to 108kPa

Storage Temperature:

-20°C to +60°C


215mm×68mm×32 mm


220g(including battery)

Electrical Outputs:

AC (Tip 3.5mm jack) and DC (middle 3.5mm jack)

DC Output:

voltage 15mV/dB, range 450mV to 1950mV

AC Output:


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