Am a bit rusty with this .php malarky so it took me a while,
line 46 of records_txt.php
<?php echo '<td>'.$Tr_rrateM.'</td><td>'.$rrateM.' '.$rainunit.'/ht</td><td>'.$TrrateMF.'</td>'; ?>
... should read
<?php echo '<td>'.$Tr_rrateM.'</td><td>'.$rrateM.' '.$rainunit.'/hr</td><td>'.$TrrateMF.'</td>'; ?>