Quantity   Component name
1 × Raspberry Pi
4 × DS18B20 temperature sensor "one-wire" temperature sensor in shielded package
2 × Flow-rate sensor Hall effect pulse output flow-rate sensor
1 × 5K resistor (or 2 x 10K is parallel)
1 × Terminal blocks To make up a patch panel for connecting all the sensor cabling
1 × 5V USB power supply To power the RPi