Tubular Spring Balance, a series of seven color-coded tubular spring scales that can be used for both force and mass measurements. Each is calibrated in both Newtons and grams with a beveled top for use on an inclined plane. The scales incorporate a unique zero adjustment with a clear plastic tube, allowing students to see the action of the spring. Complete with chrome-plated hooks and rings.  Length of tube : 160 mm, diam. 20 mm.

Set of 7:
Blue :     250g/2.5N
Green :  500g/5N
Brown : 1000g/10N
Red :      2000g/20N
White :   3000g/30N
Beige :   5000g/50N
Light brown :   100g/1N