calibration,
or, the voucher thing is a good idea, repeat custom, or redeemable there and then,
prob with the voucher I can see is it depends on the mark up for the item the customer wants,
could be an expensive item with a small margin, or a cheaper item with a big margin, how could you work one voucher covers everything????
I think that would be unworkable.
if the free calibration is too rich how about half price?
only thing then is some people couldnt care less about in a years time money off.
have you ever thought about some sort of loyalty scheme?
whereby you remain a member for 13months after purchase for special offers etc, and the more you purchase the more offers you are eligible for?
obviously it would be on a rolling membership IYKWIM, that way once you purchase a MFT you are eligible for 50% off 1 cal valid for 13months from that date,
buy an impact/combi drill you get 25% off drill/driver bits(if you sold them) or 10% on the next power tool, or something similar,
does that make sense to anyone but me?