I find it really useful when I need to weight small amount of things, like copper or sulfur for disinfect my plants.
Step 1: WHAT YOU NEED
-2 popsicle stick;
-2 pegs (like the ones in the photo);
-1 small carabiner;
-1 small keys ring;
-a piece of thread;
-1 short nail;
-1 small iron ring (I used one from the valve of the inner tube);
-2 small plastic bag of the same size;
-some bolts of different weight (1,2,5 grams)
Step 2: PREPARE THE STICKS
-draw a line in the exact middle of it (lengthwise);
-draw a line in the exact middle of the intact stick (crosswise);
-make 2 holes at the edges of the intact stick and one in the side of the half stick (like in the photo).
Step 3: GLUE THE STICKS
Step 4: PLACE THE CARABINER
Step 5: PLACE THE PEGS
Step 6: PLACE THE NAIL
Step 7: PLACE THE WEIGHT
Step 8: PREPARE THE WEIGHT MEASURE
Otherwise you can make small balls of clay of different weight.
Step 9: PLACE PLASTIC BAGS
Step 10: HOW IT WORKS
Just put some weight on a side and add things in the other bag until the thread will be perfectly vertical along the line you drew on the short stick.
Another way you can do it (instead of the thread and the iron ring) will be to place a little level horizontal along the long stick.