This KIMO C310 is dead, here's why.

This KIMO C310 works with very low pressure, and has a very sensitive cristal on it. After opening the little sensor, you can see what happen inside.
C310-BO KIMO INSTRUMENTS
After more investigation, this sensor has the 500Pa board, 5 millibars, negative and positive.
This cristal sensor seems to be a piezzo sensor, I have not found it, even if it looks like a honeywell sensor.