user2766: I'm looking for pressure sensors up to 22 kg and more. So far the highest capacity I could found was 25 lbs. Do higher ones not exist?

user2794: Your problem may be that you are using sub-optimal search terms.
The kilogram is not a unit of pressure, but instead of mass.
Scales technically do not sense mass, but instead sense force.
This is assumed to be the force exerted by a resting body under earth gravity.
Pressure is force over an area, such as pounds-per-square-inch (PSI) or the Pascal which is a newton per square meter.
Anyway, the sensor you want is called a force cell.
The nice ones are rated in newtons or kilonewtons, with a kg being equivalent to 
9.8 newtons.
Here is a load cell that take up to 50 kg.
http://www.phidgets.com/products.php?product_id=3135
Sources:
http://en.wikipedia.org/wiki/Force

2766: <p>I'm looking for pressure sensors up to 22 kg and more. So far the highest capacity I could found was 25 lbs. Do higher ones not exist?</p>
 2794: <p>Your problem may be that you are using sub-optimal search terms.
The kilogram is not a unit of pressure, but instead of mass.
Scales technically do not sense mass, but instead sense force.
This is assumed to be the force exerted by a resting body under earth gravity.
Pressure is force over an area, such as pounds-per-square-inch (PSI) or the Pascal which is a newton per square meter.</p>

<p>Anyway, the sensor you want is called a force cell.
The nice ones are rated in newtons or kilonewtons, with a kg being equivalent to 
9.8 newtons.</p>

<p>Here is a load cell that take up to 50 kg.
<a href="http://www.phidgets.com/products.php?product_id=3135" rel="nofollow">http://www.phidgets.com/products.php?product_id=3135</a></p>

<p>Sources:
<a href="http://en.wikipedia.org/wiki/Force" rel="nofollow">http://en.wikipedia.org/wiki/Force</a></p>
