... testing regulation level II.HS5618A Integrating Sound Level Meter adopts 128×64 LCD display, menu operation,clock set, 24h clock display, auto- ... real time display9.Data Auto-Storage: 1000 groups in total, 64 groups of 24h time data10. Interface: HS5618A transmits the data ... Calibration: Use HS6020 to calibrate to 93.8dB.12. Screen: 128×64 LCD13. Power: +9V external power(outside+, inside-), or 5 No ...