Resonance Instruments (PTY) Ltdoffice: +27 (11) 886 8005


Type 4448, Personal Noise Dose Meter

A shoulder-mounted, cable-free noise dose meter that simultaneously measures all parameters required by occupational noise standards. Simple two-button operation, an informative LCD display and an auto-calibration function make this unit very easy to use. The built-in memory and rechargeable battery provide several working days of measurement.


• Assessment of noise exposure at work
• Occupational noise evaluation
• Daily ‘noise watchdog’
• Selection of hearing protection


• 180 hours logging storage: Simultaneous LAeq, LZpeak and LCpeak and other parameters at 1 minute intervals
• Peak counting (135, 137 and 140 dB level exceedance)
• Pre-set measurement time up to 12 hours
• LCD display for measurement review on instrument, battery and memory status
• Keys and display lock function
• LED warning alarm for dangerous sound level
• Rechargeable NiMH battery giving 28 hours of operation time