Yes @Emanuel you are right. Giving off numbers has happened a few times. What I do after that is use the air gun for cleaning it and recalibrate. In case of sand I use alcohol but I never use lubricants as it would collect more residues with time.
Also to hit Some PSIs such as 15 specifically sometimes I have to calibrate it a bit higher. It does have these flaws.
As long as it goes back to normal operations after some love and care, I consider it to be normal due to sand. So far I didn’t have the issue where it does not go back to normal after a small maintenance….. yet .
In the 2+ years of use I did this maybe 2-3 times so it’s still ok in my opinion.
so yes it has its flaws, but manageable I would say for the job it is doing.
As a side note, and inspired from @Frederic’s story on how @Srikumar used to deflate in his early days by visually looking at it when I first joined @Carnity, it inspired me to do the following as a good practice as well, not really related to the topic but helpful to spot if things are off.
When you have time, deflate 1 tyre to 11 let’s say and deflate the other tyres to 9, 8 and 6. You will create a visual memory after a few times to spot what “good” looks like vs if things are off. Just an idea which has helped me once to spot a mini pop out during the Pajero days after a side slope when the pressure dropped to 6. Hope this helps.