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Use a ruler on  the spring to measure its length, and so calculate the extension. 

600g

This is a simulation of an experiment to measure the extension of a spring when force is applied to it. Remember that the force of gravity pulling on a 100g mass is 1N. Initiate the experiment by pressing the buttons on the right hand side.

100g

800g

200g

700g

300g

500g

400g

10g

add the mass

100g added.

(in total)

200g added.

300g added.

400g added.

500g added.

600g added.

700g added.

800g added.