Casella CEL CEL-278 - Manual (Page 30)

External power,
3.5 to 8V DC via pins 1 and 2 of auxiliary socket, at 250mA maximum.
Typically 100mA at 6V.
Batteries:
4 x IEC LR6 Alkaline Manganese type. Battery life up to 12h with
continuous use.
Dimensions: (Excluding controls and feet)
147x80 x39 mm (5.8 x 3.15 x 1.55 in).
Weight:
650g (1.45lb).
Page 30 CEL-278/2 Handbook CEL Instruments Ltd