The mean roughness Ra matches the arithmetical mean of the absolute. values related to the profile deviation y within the reference length l. Max. profile valley depth Rmax (DIN 4768) The max. profile valley depth Rmax counts for the most significant single. roughness depths Zi within the total length lm.
Benefits. Every 500 Nectar points you redeem is Â£2.50 off your total, which means more money to spend on the goods you want. You can also save further Nectar points for each Argos purchase you make, simply by presenting your card at the checkout. Simply present your Nectar card at the till and the cashier will swipe your card to automatically deduct the points from your account (subject to system availability). 2  Any remaining balance will need to be paid in full by cash, debit or credit card on the day.
Tesco and nectar are the same in basic terms. You get 2 points per 1 spent at Sainsburys but each point is worth 0.5p. You get 1 point per 1 at Tesco but it's woth 1p. So spend 1000 at either store and you'll have 10 worth of points.The difference is what you want to do with them.8. i think this is probably because Nectar points can be redeemed in lots of different places, so they could actually build up quite quickly if you do a lot of shopping in the other places (eg, BP, Homebase). I used to shop in Tesco and use the clubcard, but always found the vouchers i got were quite useless.