Castle Sonus GA257B Industrial Pocket Dosemeter ( 75-140 dB, LEpd , PLEpd , DOSE% , PDOSE%, DOHR, Pa2h, Dose per hour, Zpeak )

Applicable standard: IEC 61252-1:1993; IEC61672-1-2002 
Level range: 75-140 dB
Peak: 3dB
Linear Operating range: 67 dB
Display: LCD digit size 7mm x 5mm
Noise floor: Typical ’A’ Weighting <32 dB(A) rms
Frequency weighting: ‘A’ to IEC 61672-1:2002 and IEC 60651:1979+A1+A2
Frequency range: 20 Hz - 8 kHz (including microphone); 1 Hz - 20 kHz (electrical characteristics)
Measement parameters: LEpd , PLEpd , DOSE% , PDOSE%, DOHR, Pa2h,Dose per hour, Zpeak 
Microphone:Type 2 Pre-Polarised ½” (13.2 mm) Electret Free-Field, Electret Condenser Microphone: 20Hz – 8KHz ± 2dB; –32 dB ± 3 dB re 1V/Pa
Power requirements: Batteries: 1 x 6LR61 (size PP3), Life: >12 hours (alkaline batteries, continuous operation).
Dimensions: 60mm (width) x 30mm (depth excluding pocket clip) x 135mm (height without microphone), Microphone cable length: 800mm (including rubber sleeve and microphone)
Weight: 200gms (without battery)
Accessories: 
-GA607 Dual Level Calibrator:
-KA010 Kit Case for  GA257B, GA601 and Accessories