A great price for this gadget - compared to the analogue scales usually seen in pound shops, these are smaller, much more accurate and easier to use.
They can measure up to 40kg/88lb. The scale is in increments of 5g. I compared the measurement of a few small things with my kitchen scales and they were accurate to within 10g, which is good enough for me.
You hold it by the cloth strap and hook the item on at the bottom. The light flashes until the weight stabilizes, then the reading locks even after you've put the item down: very convenient.
The cloth strap is secure- I held up a bicycle with it no problem.
The hook folds into the back of the unit when not in use.
Takes 2xAAA batteries and powers off automatically after 1 minute.
The only weak points I've found are: #1 The hook is small, so you'd have to rig something up to fit it round a plastic suitcase handle. #2 The battery hatch doesn't fit very tightly; however I've not had it fall off.