Load cell type "S" stainless steel made, accuracy class C3, maximum capacity 100 kg and two M12 threaded holes. It consists of small elements called strain gauges mounted in precise points on the structure. It supplies an electrical signal at the output which varies according to the deformation that the force (tension or compression) applied to the component produces. The most common applications are electronic scales, piece counter, scales for suspended loads, postal packages and all varieties of commercial single-cell scales.

• Construction: stainless steel
• Maximum Capacity: 100 kg / 220 lb
• Accuracy Class: C3
• Sensitivity: 2 mV / V ( ± 0,002%)
• Non linearity: 0,02% F.S.
• Hysteresis: 0,02% F.S.
• Repeatability: 0,02% F.S.
• Creep (30 min): 0,02% F.S.
• Temperature effect on Sensitivity: ± 0,02% F.S./10°C
• Temperature effect on zero: ± 0,02% F.S./10°C
• Input Resistance: 400 ohm (± 20 ohm)
• Output Resistance: 351 ohm (± 2 ohm)
• Insulation Resistance: >5000 Mohm
• Working temperature: -10°C to +40°C
• Power supply: 5 Volt
• Dimensions (mm): 76 (D) x 49 (C) x 20 (B) 
• Weight: 530 grams
• Wires: 4 wires lenght about 250 cm
• Connections:
  - red wire – positive 5V
  - black wire – negative 5V
  - green wire OUT +
  - white wire OUT -

#include “HX711.h”
#define calibration_factor -9580.00 //This value is obtained using the SparkFun_HX711_Calibration sketch
#define DOUT 4
#define CLK 5
HX711 scale(DOUT, CLK);
void setup() {
Serial.begin(9600);
Serial.println(“HX711 scale demo”);
scale.set_scale(calibration_factor);
scale.tare(); //Assuming there is no weight on the scale at start up, reset the scale to 0
Serial.println(“Readings:”);
}
void loop() {
Serial.print(“Reading: “);
float libbre = scale.get_units();
float kg = (libbre/2.2046);
Serial.print(kg, 1); //scale.get_units() returns a float
Serial.print(” kg”); //You can change this to kg but you’ll need to refactor the calibration_factor
Serial.println();
}

• HX711 Datasheet
• Esempi