RT-Capture uses a stereo soundcard and supports 2-channel measurements
Built-in microphone calibration and frequency compensation
All settings can be password-protected and can be saved to a User-preferences file

SPL metering according to IEC 61672 standard.
Built-in weighting filters: A, C, AU and Z (flat)
Selectable time response; Slow (1s) / Fast (0.125s)

Instantaneous SPL Metering (RMS and Peak)
Six different Equivalent Continuous SPL, Leq, are calculated simultaneously; Continuous, Current, Short time (User time), Remaining, Period and Running Leq
All SPL data is event-logged and can be recorded to a log-file along with additional information
Records compressed audio-files for verification, OGG file format.

Logging can be started by a graphical scheduler.
Automatic filename generation.
SPL log-file can be printed in selected time period.
SPL log-file can be exported as tab-separated text format.
SPL log-file can be emailed periodically.