Instead of using check box you can use scroll bars.
You can set the Maximum and Minimum values for that.
So the TempratureScrollBar can be set like Minimum 30 and Maximum 120. similarly
the pressureScrollBar can be 100 and 900 in your case
But these Minimum and Maximum can be only integers - so for density you can set these limits by multiplying 100 to actual value and while reading the value you can divide that by 100 again.
These scrollbars will always be set to some value so you will not encounter a situation where any of these values are not available.
If this doesn't help you then probably you have to understand the requirement first and introduce more conditions accordingly.
Here on MSDN you can see ScrollBar controls for windows