AEMC 607 User Manual page 40

Hour meter page:
The duration of the metering uses the following format: XXXh (for hours)
XXm (for minutes) XXs (for seconds).
NOTE:
Beyond 999 h 59 m 59 s ---h--m--s is displayed, but the internal
metering duration keeps running correctly.
View of the set of screens concerning Energy measurement by short presses on
or buttons:
40
hours (h)
1
minutes (m)
2
seconds (s)
3
Clamp-On Meter Model 607 - User Manual