estimating the height of an object: a 4-inch stick (or multitool ruler) held at arms length creates an angle of roughly 10 degrees. At 25 feet, a 10° angle translates to 4 feet; at 50 feet, it becomes 8 feet; at 100 feet it's 16 feet, etc.
Hey, that's cool. I didn't know that.
-Blast, learning something without the need for penicillin
You can tune this to your own arm length by measuring the distance from your eye to the multi-tool or other measuring object in your hand and doing a bit of simple trigonometry to determine the precise angle. After that more simple trig can be used to determine the distance to objects of known size (height or width). This is good stuff.
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