+ weighs when the telescopic boom is retracted or extended; to be decided at time of calibration,
+ normal accuracy about 1%, when truck is fitted with a bucket, worse with forks because the load center can vary, hence the weight arm and lifting force,
+ digital display in the cabin.

Options:
+ printer on tickets or paper roll,
+ transfer of weight data to PC by chip card or GSM,

2 measuring principles are available:
  A. Measure the hydraulic pressure:

       a pressure transducer must be inserted between the check valve and the lift cylinder,
       an inductive switch detects when the boom is at the proper height.

  B. A strain gauge measures the bend of the boom:
       independent of the hydraulic system condition and built-in valves,
       permanent signal allows to mix and dose,
       see the green picture.
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