The OHD/Cirrus Research Optimus™ RTA Sound Level Meter’s color OLED display allows the user to set color coding for levels and it auto-adjusts for any lighting condition. The Optimus measures all data in one measurement; never again worry about incorrect settings. This includes the entire 120dB dynamic range; just press three buttons. Voice tag allows you to audibly notate the measurement which means no more log sheets. Occupational Health Dynamics,, (888) 464-3872. Circle 240OHD_300px.jpg