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You can get Strain Gauges, Load Cells and the HX711 IC here (affiliate links):
Aliexpress:
Strain Gauge: https://s.click.aliexpress.com/e/_d6Q...
Load Cell: https://s.click.aliexpress.com/e/_dTf...
HX711: https://s.click.aliexpress.com/e/_dXe...
Ebay:
Strain Gauge: http://rover.ebay.com/rover/1/711-532...
Load Cell: http://rover.ebay.com/rover/1/711-532...
HX711: http://rover.ebay.com/rover/1/711-532...
Amazon.de:
Strain Gauge: http://amzn.to/2BGbEIg
Load Cell: http://amzn.to/2npyuks
HX711: http://amzn.to/2khmhxh

In this episode of electronic basics we will have a closer look at strain gauges and load cells and find out how we can use them to measure weight. Along the way we will talk about the wheatstone bridge, suitable amplifier circuits and how we can use a µC to output the measured values of our weight measuring system.

Music:
2011 Lookalike by Bartlebeats
Killing Time, Kevin MacLeod
(incompetech.com)