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This disc load cell (sometimes called a strain gauge) can translate up to 50kg of pressure (force) into an electrical signal. Disc load cells are a bit easier to mount than bar-style load cells, making them more straightforward to implement into a design. Each load cell is made from an steel-alloy and is capable of reading a capacity of 50kg. These load cells have four strain gauges that are hooked up in a wheatstone bridge formation.
More information is available on the website of Sparkfun.