An intrinsically safe version of Type 4445 is also available. This model is designed to meet the requirements associated with ATEX certification code EEx ia I M1 and EEx ia IIC T4 II 1 G, which makes it particularly suitable for use in hazardous areas such as mines, printing works, petrochemical plants and other areas that require the use of Ex-rated instruments. With the optional Stalk Microphone (MM0274) fitted, it becomes a hand-held, Type 2 sound level meter. Post-processing of data can be performed using PC Software Noise Explorer Type 7815 and Protector Type 7825.