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Plastic, desktop call unit meter used in order to calculate telephone charges. The meter has two analogue indicator panels (relays). The top meter calculates the total units consumed in telephone calls (marked as "Total"). The bottom meter calculates the units consumed in each individual telephone call. On the right, a white button resets and restarts the call unit meter for each individual call. On the left, a red button resets and restarts the meter for the overall telephone unit consumption.