Casella CEL CEL-440 - Manual (Page 61)

Note that when an instrument is returned to battery operation
after being powered from an external supply, either switch the
instrument OFF then ON again, or disconnect ALL devices from
the DC input socket, in order to avoid additional discharging of
the internal batteries.
Dimensions:
340 x 100 x 40 mm (13.5 x 4 x 1.5 in),
500 gm (17.5 oz) excluding batteries.
5.2 CEL-480
In addition to those listed above for the CEL-440, the CEL-480 has the
following features.
Calendar & Clock:
12 preset cumulative measurement runs times from:
1m, 5m, 10m, 15m, 20m, 30m, 1h, 2h, 4h, 8h, 12, 24h.
Fixed Integration Periods:
1, 5, 10, 15, 20, 30 s, 1, 5, 10, 15, 20, 30 mins, and 1 hour.
Runs always start on a whole second, so start, end and duration
times do not have to be all displayed to 1/100 second to match.
SPL is always being measured except while in Wait mode when
there is 5 minutes or more before the start of a run.
Fixed Measurement Durations:
1, 5, 10, 15, 20, 30 mins, 1, 2, 4, 8, 12 and 24 hour.
Delay Start/Stop Times:
7 user selectable by date and time to nearest minute.
(Before V 2.0 firmware: 6 start and stop times.)
Broad Band Storage Capability:
999 runs, each with up to 9999 periods plus profiles up to a
maximum of 245 000 total results.
CEL-440/480 Operators Handbook - Page 61
Specification