This sensor can measure the pressure of any contact surface statically and dynamically. The membrane pressure sensor converts the pressure applied to the sensing area of the sensor into a resistance signal, and then obtains the change of external pressure according to the calibration curve of the force-resistance. Information, the greater the pressure, the lower the resistance of the sensor output.

Require supply voltage : 5V
Sensing area : 40mm by 40mm
Weight range : 500g to 20kg

Pinouts Descriptions
VCC +5V supply in
GND Gnd
AO Analog out : range 0 to 3.3V , corresponding to pressure on sensor
DO Digital out : low or high

Adjustment
AO-RES Analog output gain adjustment
DO-RES Digital threshold adjustment, adjust the weight pressure needed to change the DO to high

You are paying for the following:
1 pcs Sensor
1 pcs amplifier board