HT157 is mobile integrating sound level meters Type (Class 1) which can be used to monitor the equivalent level of nose (Leq), measure Peak values, check soundproofing levels, acoustic pollution, etc.


Ii is also indicated for certification according to the Leg. Decrees currently in force as regards environmental noise measurements and in working environments. These devices have a wide measuring range (from 25 to 140dB) and multiple functions such as statistic analysis, 24H analysis, integration of Leq over time, which are indispensable elements when measuring.


These models also allows carrying out detailed analyses of spectrum components of noise using integrated octave-band filters and 1/3 octave-band filters (only HT157) and they are provided with an internal memory to save data and with a USB interface for transferring data to the PC through dedicated software in a Windows environment with possibility of numerical, graphic and statistic display. Sound level meters ape provided with a practical and resistant case with a mobile calibrator for preliminary checks before each measurement is carried out.

HT Instruments HT157 Digital Integrating Decibal Meter Class 1 (25 to 140dB)

  • Device category (Class) Class 1
    Noise measuring range 25 ÷ 140dB
    Noise measurement resolution 0.1 ÷ 0.01dB
    Frequency range 10kHz ÷ 20kHz
    Dynamic range 90dB
    Measurement of sound pressure level (SPL)  
    Measurement of equivalent noise levels (Leq)  
    Frequency weighting A/C/Z A/
    Integration over time Fast/Slow/Impulse
    Integration with programmable period  
    Peak measurements (Peak-, Peak+)  
    Display of MAX/MIN values of SPL  
    Statistic analysis of noise with "A" weighting  
    SPL analysis in 24H  
    Spectrum analysis with octave-band filter (1/1) 19Hz ÷ 16kHz
    Spectrum analysis with 1/3 octave-band filter  
    Provided mobile calibrator Class 1
    Manual calibration with trimmer  
    Precise calibration with internal procedure  
    Pre-polarized “1/2” condenser microphone  
    AC and DC analogue outputs with 3.5mm jack Only AC
    Internal memory for data saving 128
    Recalling of results on the display  
    Mini-USB interface for PC connection  
    Windows software for saved data analysis  
    Display LCD 240 x 160
    Display backlight  
    Power supply  
    Provided external power supply  
    Reference standards IEC61672 Class 2 - IEC61620 Class 2
    Size (LxWxH) (mm) 285 x 90 x 39
    Weight in grams (batteries included) 500