{{{(make-chronometer)}}}
Returns a new chronometer object.
{{{(chronometer-start! )}}}
{{{(chronometer-stop! )}}}
{{{(chronometer-reset! )}}}
resets time to zero.
{{{(chronometer-accuracy )}}} ;; optional
{{{(chronometer-time )}}}
measures the elapsed accumulated time in real number of seconds between the starting times and stop times.