I made sharp tester based on arduino. It measure pressure on cut the nylon.
Used materials:
Arduino board: wemos d1 mini
Scale sensor: 5kg Pressure Sensor HX711 Weight Sensors (find on ebay or amazon)
Display: Oled 16x2 with I2C serial interface
Fishing nylon: dia 0.3 mm
Video: https://youtu.be/PwhbXROubpc