The plastic folding rules also come with plastic folding rule with hidden hinges. The glass fiber reinforced plastic is waterproof, the scales are deeply edged. The accuracy is according to EC-class III, = +-1 mm per 1 m and +-1.4 mm per 2 m. Aluminium folding rule made by BMI

Folding Rulers | Klein Tools Folding Rulers | Klein Tools

This wood is very tough and hard and considered as the best for a wooden folding rule. The hinges are of Swedish steel, the rivets are not visible and oiled durable. The accuracy is according to EC-class III, = +-1 mm per 1m and +-1.4 mm per 2m. Our folding rules are made by HULTAFORS in Sweden from a slowly growing birch near the Arctic circle.

Fiberglass Folding Rule, Inside Reading