A pressuremeter is a meter constructed to measure the “at-rest horizontal earth pressure”.
A man named Louis Menard in 1955 first brought the pressuremeter to the forefront.
The probe of the pressuremeter is inserted into the borehole and is supported at test depth.
[1] The probe is an inflatable flexible membrane which applies even pressure to the walls of the borehole as it expands.
As the pressure increases and the membrane expands, the walls of the borehole begin to deform.