This iron mass is an item supplied to primary schools for MOE CPDD SSM project. Made of solid iron and coated with nickel to give it a chrome-like finishing and non-rusting surface. It is very accurate as a calibration weight.
This weight is of M2 class according to the OIML standard, as such it is more than 99% accurate. Comes with a protective (padded) barrel casing to make it lasting.
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Tags: Mass & Weights, Mathematics, Manipulatives, Hands-On, Mass & Weights, Pre-school, early childhood, Mathematics, density, weight, iron mass