The Force 4 Click Board™ is based on HSFPAR003A piezoresistive force sensor from Alpsalpine. This product is a force sensor using the effect of a piezoresistive bridge circuit formed on a silicon diaphragm. Piezoresistive force sensors achieve higher linearity than other force sensors.
To help with stability and accuracy Force 4 Click Board™ also includes MCP1101-33 a high precision buffered voltage reference as a power supply to a force sensor that allows high stability and accuracy of output voltage readings.