You can use unpack to split apart fixed-width data like this:

# assumes 5 columns, each 10 characters
my $fmt = "A10" x 5;

for (@array) {
  my ($testnumber, $llimit, $value, $ulimit, $unit, $name) = unpack($f
+mt, $_);

  ##
}
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Consult perldoc -f pack for more information. The "A" pack format will remove trailing whitespaces when unpacking. If your data is right-aligned (it's hard to tell with your variable-width font), you will have to remove leading whitespaces manually.