The ruler keeps wanting to retract. There is a lock (which must be set RIGID) but pulling the blade out even a little will unlock the lock and retract the ruler. The ruler has a wider and deeper curved blade to allow for more "protruding clearance". This more severe kink causes the blade to fold sideways and twist into a spiral that can only be recovered by retracting/re-extending. This is especially true when measuring along the ground. When using this ruler, I feel like getting the blade out and keeping it there is a constant competition. Otherwise, the ruler is easy to read and durable.
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