Harnessing technology combined with a thoughtful insight into how people use it is the key to product development. The Castle Mirus epitomises these concepts bringing state of the art electronics and a clear user-interface to the world of sound level meters. The result is a very small instrument (only 56mm wide and 20mm thin), with a full range of measurement capabilities including optional 1/1 and 1/3 octave band analysis for a greater understanding of the frequency content of the noise you are measuring. Not only this, but there is a colour display, micro-SD memory card expansion and up to 24 hours running time. All this comes in a package that only weighs 225g.