I don't have one, but I wish I did.... and I know the one I would buy as well!!!
http://www.cutleryandmore.com/details.asp?SKU=9811
SALTER Nutri-weigh Dietary Computer Scale
Analyses the nutritional content of your food by portion size.
Calculates the calories, protein, carbohydrate, total sugars, total fat, fibre, sodium, cholesterol, net carbohydrates & G.I value of your food on a large LCD display.
The database stores the nutritional values of over 1430 foods and memorizes in additional 100 foods/recipes of your choice!
Automatic predictive text feature for quick and easy onscreen food search.
2 user memory.
Removable stainless steel cover, resistant to staining/carry over flavors and easy to clean.
Can also be used as a conventional scale.
Add & weigh feature enables you to weigh all your ingredients in one bowl.
Allows you to record your daily food intake and to set your own dietary goals, then review your progress at any time.
Switch to select either UK or US food list as preferred