, Calibrated in cm on one side and inches on the other
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Meter Stick 1 x 1/16 - Plain - Ajax Scientific Ltd
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How to Read a Measuring Tape: Imperial and Metric Markings
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These 45mm magnetic compasses have sighting slits in the end of the case.
Sighting Compass 45MM Diameter with Sighting Slit
Meter Stick 1 x 1/16 - Plain - Ajax Scientific Ltd