Product Overview
This is the traditional Scale of Hardness Collection (without diamond) and a Test Kit. Includes Streak Plate, Penny, Glass Plates, Nail and nine specimens 1" x 1-1/2" that are number coded. Grades 6+, Ages 11+.
This is the traditional Scale of Hardness Collection (without diamond) and a Test Kit. Includes Streak Plate, Penny, Glass Plates, Nail and nine specimens 1" x 1-1/2" that are number coded. Grades 6+, Ages 11+.
