[xnorswap]

Waitrose do have a weighing device, but it's calibrated to have a very generous tolerance.

They trust their customers (or trust their profit margins!) enough to have it calibrated at such.

The result is a very pleasant experience compared to Sainsbury's where it feels like you're mistrusted. Just re-adjusting your bags seems to need a staff member to come over and fix the inevitable "discrepancy".