• Total Environmental Monitoring Solutions...since 1990.

Our Product Range

  • Instrumex
    No. 106, Ashish Udyog Bhavan, Opposite S. N. D. T. College, Liberty Garden Road, Malad West Mumbai - 400064, Maharashtra, India

  • +(91) - 9322873609
    +(91) - 9322235281

Noise Dosimeter

Model No : GA257L

Powerful, yet small and lightweight, the Castle GA257L noise dose meter combines the latest technological advances with a realistic price tag. With it's clear and easy to read 8 character alpha numeric display, soft-touch keypad, electronic security lock and instant calibration facility, the GA257L is sure to prove invaluable in a wide range of occupational health applications.


• Measures Lp, Lep'd, Dose%, Dose per Hour andPa2H
• Measures simultaneously LAeq and either LZeq or LCeq
• User selectable Exchange rate, Threshold and Criterion level.
• C or Z weighted Peak
• Save results to internal flash memory Download data to a PC via a USB connection
• Analysis software included with the meter
• Small and light weight, fits into small shirt or jacket pocket
• Lockable Key pad
• Constructed of tough crack resistance plastic.
• Single battery operation of approximately 12 hours
• Supplied with a strong clip for attaching to a belt or shirt pocket

Product Specifications

Frequency Range
Accuracy Class 2 / Type 2
Level Range RANGE=70-140
PEAK RANGE=80 – 143dB
Microphone ACO 7146A pre-polarised ½" condenser microphone, 25mV / Pa
Analog Output
Power Supply 1 x PP3 (9V)