Mear calculators are of the highest quality, precision made from non-warping white and clear acrylic, with main dials 3mm thick and subsidiary dials 1.5mm thick. All scales and lettering are clearly and sharply engraved, not printed, and are filled in multi-colours to facilitate use.
METRIC AND U.S. MODELS
Standard instruments are calibrated in Imperial units, but most of them are now available in exactly similar designs calibrated in S.I. Metric units and some are calibrated in U.S. gallons. The availability of Imperial, Metric or U.S. models is indicated for each calculator.