The apparatus demonstrates the phenomenon of Habit Interference with the underlying fact that time taken to accomplish a practiced task is less than time taken to accomplish a new task. The apparatus consists of a tray with many numbered boxes and number indicating cards accordinmore...
Sorting trays for beads, and for accurate grading and shading of diamonds and gemstones. Available in black and white color. S-249 A - Round Corner S-249 B – Square Corner more...
PRACTICAL SORTING TRAYS Ideal for displaying your precious stones, diamonds etc. more effectively. (Special for counter display) Available in Black or White Colour RECTANGLE SORTING TRAYS Sorting trays for beads, and for accurate grading and shading of diamonds and gemstones. Amore...