When it comes to hanging artwork and mirrors when doing wall arrangement for staging, do you take a chance and guess at the weight when selecting the proper hangers? Do you use the weigh-yourself-then-step-off-the-scales-and-weigh-yourself-again-while-holding-the-piece method which requires more time, an accurate scale and quick math skills? Why take a chance or do the dance when you can be more efficient and professional by simply using a hanging scale?
Sometimes referred to as a fisherman's scale, a hanging scale takes up little room in your tool case and can be a time, anxiety and even a money saver by avoiding using the wrong hooks. You can find these in sporting goods stores and sporting goods departments in places like Walmart and Kmart, though generally the maximum weight you will find in these places will be closer to 25 pounds.
Larger capacity hanging scales like the one below may be available in specialty catalogs devoted to travel needs:
This one is $14.98 from The Johnson Smith Company or Sky Mall. It has a capacity of up to 75 pounds and includes a retractable measuring tape.
If you are want something a little more sophisticated and/or a scale that has a larger weight capacity, here is another model to consider. The one shown below has a digital read out and has a capacity of up to 100 pounds. It is $29.95 and runs on two included AAA batteries. It is also available from Sky Mall

Both models weigh less than a pound and can fit easily into a tool case. It's a great tool to have in your inventory.
It can also save you excess weight fees for overstuffed luggage when traveling!
Very clever! I usually try to choose lightweight artwork just because I have a lot of lifting with other items. Mirrors (on the other hand) are never light. Thanks for the time saving tip!