The top of the range Optimus Green has been specifically designed as an environmental sound level meter and is use for measuring environmental noise and noise pollution. With a range of features and functionality that allow you to measure multiple parameters simultaneously, there’s no other device you could need. The B & C variants of the instrument will measure and store real-time 1:3 octave bands from 6.3Hz to 20kHz throughout each and every measurement, with the overall value along with a time history, stored automatically. The C variants use either the ISO 1996- 2:2007 Simplified Method or the Cirrus Improved Method to highlight tonal noise in 1:3 octave bands. The Reverberation Time (RT) Module is an add-on (Purchased) for the NoiseTools software that allows the calculation of RT60, RT30 and RT20 values from either interrupted or impulse noise source data in accordance with EN ISO 3382-2:2008. Using measurement data that has been downloaded from a suitable Optimus Sound Level Meter (e.g Optimus Green+ B&C Variant), the module determines if the data is of sufficient quality and where the data is deemed to be suitable, calculates the required values in accordance with EN ISO 3382-2:2008. As well as the VoiceTag recording, the Optimus Green instruments provide audio recording during measurements using the Acoustic Fingerprint technology. Recordings can be started either manually or automatically when user-defined triggers are activated. Audio recordings can be stored either as studio 96/32 quality, which can be used for later analysis; high 48/24 quality; or as standard 16/16 quality, which can be used for replay and source identification.