if you can get the contents of that element inspection into a plain text file, AND you're pretty sure that there's only one table row named "zoneval7 you COULD just use a simple regular expression to extract the value:
$var = 'undefined'
if ($html -match '<td id="zoneval7">([^<]+)'){
$var = $matches[1]
}
$var
Otherwise you'd have to load the data into an HTMLDocument COM object and navigate your way down to the correct table and then find the table row.