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The min/max block will continouosly monitor another block (or expression) and report on its current minimum/maximum value since the simulation started, or, as we saw in the last experiment, until it is reset. The result is a plot like this:

However, if we want to use this value for a calculation, we are not interested in the current minimum or maximum. We want the maximum when the block reset last time.

In the example above, one could imagine a conservative calculation which uses the maximum value from the previous month to calculate the dose of a person exposed by the poisoned soil.

The trick is to use another block, the snapshot, in order to capture the maximum value each time a month begins.

1. Continue with the model from the last experiment and add a snapshot block.
2. Edit the block
3. In the Properties screen,
   1. Change the name to “Soil_maximum”
   2. Set the unit to _mg_
4. In the Values screen,
   1. Enter the name of the min/max block _Monthly max_ in the Target field
   2. Select the Month_event block in the Event field
   3. Enter 0.0 as the Initial value

1. Run a simulation and make a plot of _Soil_ and _Soil_maximum_
2. The plot should look like this: