Does not require sanding and does not leave sharp splinters when cut. 10 mm X 10 mm X 2 feet long. 4 mm X 2 feet long. Made in Canada, these plastic and metal spring scales are calibrated in grams and Newtons. Also known as force meters.
Smaller ranges are more sensitive, but have less capacity.
Hard plastic with metal centre shaft. Made in Canada. Build simple cranes and more advanced constructions. Not recommended for children ages 3 and under. 5 mm hole 30 mm dia.