Personal noise dosimeter
Type 4444/4445 Bruel and Kjaer

Logging Noise Dose Meter Type 4445 and Noise Dose Meter Type 4444 are specifically designed for making noise dose measurements. The measurement process consists of these simple steps:

Attach the instrument and microphone
Start the measurement
Stop the measurement at the end of the day
Check the results – they are saved to printout in the future, or for download to post-processing software

Logging Noise Dose Meters Type 4445 and Type 4445 E include all of the functionality of the Type 4444, plus some powerful extras that make it much more effective in the struggle against hearing loss on the job. Added features include:

Statistical analysis of noise levels
Logging of data (that is, recording of time histories)
Timers for setting up automatic start and stop of measurements