Seriously, though - you could get a pretty good reading using a ruler and any object of a suitable known mass.
If you don't have digital balance at home, try taking an object to your local post office and weighing it. Even something like a rock from your garden or a red brick would be fine. Come to think of it, a red brick (or a piece of one) would be perfect...
1)measure the spring unloaded.
2)balance the known weight on top (a little guidance with your free hand to keep it balanced won't make any difference to the reading)
3)measure the spring again.
4)do the maths...
Cheers,
Ty
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