Hello I have seen where a lot of people ask how to read the Sevtest gauge .Will I got my email back from them and this is what they said : Andy, It works like this: As you inflate the main chamber, the PVC stretches. This moves a strip of material imbedded in the gauge. When the little fabric gauge gets between A and B, you are at the approximate working pressure for the boat/kayak. Thank you,MikeColeman/Stearns Consumer Service Original Message Follows: ------------------------what is the air pressure in a Sevylor FH 360.how firm should how do you read the sevylortest strip can it be used to check air pressure.Like air up first sec to the A mark and the rest to B mark. I have two other people that have FH360 and they need to know too.Thank you Andy. I know other people said to do it diff but this is how they said to do it so figg they know what they are talking about .i called Sevylor and they told me the same thing .They said the pressure for the FH360 is .065 bars or .9 lbs