Quantity   Component name
1 × Particle Electron I know it, have one. and like it.
1 × JSN-SR04T with a waterproof probe https://botland.com.pl/ultradzwiekowe-czujniki-odleglosci/7266-ultradzwiekowy-czujnik-odleglosci-jsn-sr04t-20-450cm-z-sonda-woodoporna.html
1 × AA holder for 4 batteries https://botland.com.pl/koszyki-na-baterie/173-koszyk-na-4-baterie-typu-aa-r6.html
1 × Cable Gland for making the probe to case connection weathersealed