In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

A timer which counts upwards from zero for measuring time is often called a " stopwatch " .
A timer which counts upwards from zero for measuring elapsed time is often called a " stopwatch , " while a device which counts down from a specified time interval is more usually called a timer .