Acid Testing Needles 3Pcs Assorted Watch Parts This is a new set

This is a new set of 3 black gem cases that contain removable clear plastic round jars

It measures approximately 6 1/2" x 14 1/2" (16 x 37 cm

The magnifier lens measures approximately 2" x 4" (50

Gemstone Weight- 0

12 Spring rings clasps that measure approximately 9 mm (3/8") in diameter

Acid Testing Needles 3Pcs Assorted Watch Parts This is a new set3 New Acid Test Needles This is a new set of 3 acid testing needles These needles test 10K, 14K and 18K gold They are used to determine karat content of gold The needles and the item to be tested are rubbed on a test stone and treated with acid to determine a match Newer versions of the item shown may be shipped, as a result, there may be a slight variation in color and design.