AMQYDT Mohs Hardness Test Kit, 1-10 Scale Tester Pen with Ten Star Design for Rock, Industrial and Gemstone and Mineral, Mineral & Rock Hardness Tester for Geologists, Collectors & Hobbyists
AMQYDT Mohs Hardness Test Kit, 1-10 Scale Tester Pen with Ten Star Design for Rock, Industrial and Gemstone and Mineral, Mineral & Rock Hardness Tester for Geologists, Collectors & Hobbyists
10-Scale Precision Pins: 10 pins graded Mohs hardness 1–10 for accurate mineral/rock hardness identification in professional testing