Found this on the Royal Mail website before xmas and mine just arrived today, a small cardboard balance to help decide if your letter is up to 60 gms or over without resorting to kitchen scales 
From the website:
Overview
Weighing letters to find the correct postage, especially for sending abroad can sometimes be a problem: kitchen scales can't do the job accurately enough, you're too busy to get to your local Post Office™ branch, and you think...just think that the letter in your hand is a wee bit too heavy for the standard postage. Using the wrong postage could mean that the item could be returned to you - or that you're paying too much. What do you do? That's where EasyWeigh can help. A simple, cardboard weighing device, EasyWeigh weighs letters from 20g to 100g, and is completely free to order. We even pay for the postage. Which we calculated on an EasyWeigh as being 28p.
Key features
* Weighs letters for UK, Europe and worldwide delivery
* 20g to 100g (please note: the first weight step for mail outside Europe is 10g)
* Simple cardboard construction available in three fun designs: Calypso, Bullseye, or Daydream
* Free to order, with quick despatch
What it costs
EasyWeigh is free. Order it online today.
What to do next
Order online now. Just click here and we'll have your EasyWeigh on its way to you within 48 hours
Get your free Easyweigh today
From the website:
Overview
Weighing letters to find the correct postage, especially for sending abroad can sometimes be a problem: kitchen scales can't do the job accurately enough, you're too busy to get to your local Post Office™ branch, and you think...just think that the letter in your hand is a wee bit too heavy for the standard postage. Using the wrong postage could mean that the item could be returned to you - or that you're paying too much. What do you do? That's where EasyWeigh can help. A simple, cardboard weighing device, EasyWeigh weighs letters from 20g to 100g, and is completely free to order. We even pay for the postage. Which we calculated on an EasyWeigh as being 28p.
Key features
* Weighs letters for UK, Europe and worldwide delivery
* 20g to 100g (please note: the first weight step for mail outside Europe is 10g)
* Simple cardboard construction available in three fun designs: Calypso, Bullseye, or Daydream
* Free to order, with quick despatch
What it costs
EasyWeigh is free. Order it online today.
What to do next
Order online now. Just click here and we'll have your EasyWeigh on its way to you within 48 hours
Get your free Easyweigh today
