TIKATARER Gemstone Refractometer, Portable RHG181 1.30-1.81 Professional Gemstone Identification Jewelry Refractometer, Gem Tester, Ideal for Identifying Single Double Gems
Blaihild Gem Refractometer, Portable Lightweight 1.30 1.81 Professional Gemstone Identification Tester with 3ml Reflective Index Fluid for Jewelry Gold Silver Diamond
Fafeicy Sugar Alcohol Meter, Portable Handheld Refractometer, Portable Handheld Refractometer Hand Held Sugar Content Measurement 1.000 to 1.130 SG 0 to 32 Brix Sugar Alcohol Meter
0‑28% Salinity Optical Refractometer Portable Handheld Refractometer for Seawater Aquarium
Salinity Refractometer Portable Handheld Optical Refractometer Fast Accurate Measurement for Seawater Aquarium Plastic Aluminum 17.2x4x4cm