Please help troubleshoot Scrape Sensor / Beautiful Soup with very simple web page

Configuration
1

I have a new old stock CO2 / Temp / Humidity sensor from a company that went out of business. The sensor has a ethernet port where it hosts a web server and displays the sensor values on a very basic html page.

Here is the full html for the temperature value @ http://192.168.1.101/setget?%sen-1
<b>handler.setget(<tt>%sen-1</tt>)</b><br><tt>21.560</tt>

I’m trying to use sensor scrape like this:

-sensor:
platform: scrape
resource: http://192.168.1.101/setget?%sen-1
name: Temperature
select: ‘tt:nth-of-type(1)’
unit_of_measurement: ‘C’
scan_interval: 60

this returns

%25sen-1

I’ve been using the w3school “tryit editor” to test my CSS selections and it seems like the only one I can get to work is:
tt:nth-child(3)
unfortunately nth-child isn’t supported by HA/soup…

I also got this to work with the “tryit editor” but it doesn’t work in HA, I think because my actual code lacks body tags?
body>tt:nth-of-type(1)

here is my “debug” code I’m using to test

<html>
<head>
<style> 
body>tt:nth-of-type(1) {
    background: red;
}
</style>
</head>


<b>handler.setget(<tt>%sen-1</tt>)</b>
<br>
<tt>21.560</tt>


</html>
2

I’ve found several solutions with CSS to make my selection but none of them work in Soup / HA :frowning:

tt:nth-child(3)

body>tt:nth-of-type(1)

br + tt

Any ideas how to make this selection with nth-of-type which seems to be the only selector beautifulsoup likes