... adopts 128×64 LCD display, menu operation,clock set, 24h clock display, auto-meter and store data functions. ... Range: 20Hz~12.5kHz4. Frequency Weighting: A, C5.Time Weighting: F(Fast), S(Slow)6.Auto- Measuring: ... 1h,8h,24h,24h time8.Clock: Y/M/D Hour:Minute:Second real time display9.Data Auto-Storage: ... 1000 groups in total, 64 groups of 24h time data10. Interface: HS5618A transmits the data to HS4784 ...