This is an extension to the event. In some tasks there may be many events which are set in order, e.g. in a 10 day weather forecast an event might be set every six hours, more than 40 events. These events are set in increasing order. By creating a meter that can have values, in this case from 0 to 240, will help to have more valid information on the display.
In a suite definition file one would have
task forecast
meter step 0 240 240
- meter name min max [colour-change]
The meter can be used in triggers in the same way as the events, except that the meter will have a value, e.g.
task plot5days
trigger fc/model:step eq 120 # 5 days done
The numeric value used in the triggering means that there is an ambiguity if you have a node with the same name, let's say task "120". Earlier versions of SMS required that names start with a letter. (This rule was relaxed with a warning in 4.1 and 4.2 didn't even issue a warning message).