The SM50 was designed from the ground up by the inventors of STIPA and is a fully compliant Speech Transmission Index measuring device as specified in IEC-60268-16 4th ed. (2011). It offers two STIPA measuring modes: a quick screening mode, optimized for ease of use and for quick use, and a "Pro" mode that offers the most complete and versatile functionality of any Speech Transmission Index measurement to date.
In addition, the SM50 is also a fully compliant class 2 sound level meter and a real-time analyzer. All functions featured on the Bedrock SM30 instrument are also included on the Bedrock SM50, perhaps making this the only acoustic measuring instrument you'll ever need.