I work for a volunteer group that builds wheelchair ramps; We have installed many 4x4 uprights and this is the perfect tool. Two bubbles allow you to check the plumb line in two directions without moving the instrument. This is way better than moving the default layer back and forth! After the first job, others bought them, so we often use a pair at a time. I haven't used the third bubble for the level yet. The only reason to deduct a 5th star is that the rubber band looks like it's about to fail; it has been used maybe 20-30 times so far. I'll shop around for the right size and keep a few in my tool box; Perhaps the manufacturer should include at least one spare with the kit or use stronger tape.
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