Question about NewCon Optik LRB 20,000 A Laser Rangefinder

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I have LRB20000 .It gives wrong measures and the measures are different values even when we aim at the same target .Some times the indicator gives zero reading .There is no stimulation tone when pressing measure. thanks alot

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I overheated my Makita 9557PB angle grinder. I replaced the brushes. Bearings seem ok: the motor assembly turns freely, smoothly, and quietly. The running motor is slow, with a loud "grinding" sound.

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