HTTP API for LastValue returning result with &lt prefix

Hi

I'm trying to create a sensor compares the last result of two other sensors. One value should be less than 1. The other value should be 200-500

The problem i am having is that when the value of one sensor is less that one, i get the value prefixed with "&lt"

This is REALLY problematic as i need to do a comparison between two numbers!!

How can i get it to return just a number??

The code i'm using looks like this:

		$Method = 'POST'
		$ContentType = 'application/json'
		
		
		$URI_SensorBP17 = 'https://prtg.oursite.com/api/getsensordetails.json?id='+$SensorIDBP17+'&[email protected]&passhash=123456789'
		$URI_SensorBP18 = 'https://prtg.oursite.com/api/getsensordetails.json?id='+$SensorIDBP18+'&[email protected]&passhash=123456789'

		 # This function returns a deserialized object (not JSON!)
		$contentL1 = Invoke-RestMethod -uri $URI_SensorL1 -Method $Method -ErrorVariable errmsg -ErrorAction SilentlyContinue -ContentType $ContentType
		$contentL2 = Invoke-RestMethod -uri $URI_SensorL2 -Method $Method -ErrorVariable errmsg -ErrorAction SilentlyContinue -ContentType $ContentType


		if (($contentL1.sensordata.lastvalue -gt 5) -and ($contentL2.sensordata.lastvalue -lt 5)) {
			# Active on L1
			$xmlToPRTG = @" 
			<prtg>
				<result> 
					<channel> Failover Monitor </channel> 
					<value>50</value> 
					<LimitMode>0</LimitMode>
				</result>
			</prtg>
"@;
			$xmlToPRTG 

And when lastvalue < 1, for the output i get:

$contentL1.sensordata.lastvalue = &lt; 0,01 Mbit/s

api last prtg