foreach my $measurement ( sort keys %{ $measurements } ) { 
  print "Measurement: $measurement\n";
  foreach my $try ( sort keys %{ $measurements->{ $measurement } } ) { 
    print "  Try: $try\n";
    print "    Date:  $measurements->{ $measurement }->{ $try }->{'Date'}\n";
    print "    Value: $measurements->{ $measurement }->{ $try }->{'Value'}\n";
  }
}