The HD2110 is a precision integrating portable sound level meter, with data log-ging functions, performing both spectrum and statistical analysis. The instru-ment has been designed in order to offer high-performance analysis of acoustic phenomena, with particular regard to Italian legislation on environmental noise. Attention has been paid to the possibility of adjusting the instrument to regula-tory modifi cations and to the necessity of meeting its users’ needs of today and tomorrow. The HD2110 can be integrated with other options to extend its application scope at any time; the fi rmware can be updated directly by the user by means of the DeltaLog5 program supplied with the instrument.