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This is an English specification product of "calculation scale No.27N" (this is the most popular circular measuring measuring measuring that is not added, subtraction, and it is a basic calculation scale that can be easily calculated such as multiplication, division, quadruple and triplysis, and is used in all fields. Calculation type: General exclusion, proportional (exponent hundred ratio), square and cu. Reverse side: Length and area, volume, mass, temperature, pressure, speed, etc. are listed for unit conversion Scale: D, C, CI, A, K (surface) Dedicated storage case, instruction manual included.
