This is an easy-to-make project and very cheap - each meter should cost around a £1.00. Inevitably an over-enthusiastic pupil will pull too hard on the spring and over-extend it (once this happens it has to be replaced) but as the spring costs 10p its not a disaster! You may wish to colour-in the stick bright red beyond the 4 Newton mark to warn against this or write STOP! I don't why I said 'black' tubing - you can of course use the similar white plumbing plastic pipe - also available from DIY superstores. As I suggest in the video your force meter could them be used in science experiments and investigations to measure pulls/forces. The spring and wood used are available from my supply service at www.slstc.southwarklea.org.uk
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