UCTRONICS 20KG Digital Servo Motor with Bracket Kit, High Torque Arduino Servo for Robotic Joints, DIY RC Car, Building an x-y Raster Scanner
- Digital Servo: RDS3218 digital servos specially designed for robots. Faster speeds, higher torque and better holding capability than analog servos..
- Biaxial Servo: Easier assembly than the uniaxial servo kit, dual ball bearings work better than plastic bearing and metal bearing, highly recommend if your application demands heavy side loads..
- Extensible Servo: Controllable angle range from 0 to 270 degrees, move wider than the standard 180 degrees.
- the U-shaped brackets have many different predrilled hole patterns made for lining up with the various bases and mounts..
- Wide Applications: For robotic joints, DIY RC Car, building an x-y raster scanner, and other Arduino or Raspberry pi robotic projects..
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Gem Refractometer, RHG181 1.30-1.81 Jewelry Professional High Accuracy Gemstone ldentification Portable Gemological Gemelogy Refractometer with Electric Torch, Reflective Index Fluid for Gemologists
- Refractive Index is one of the most important optical parameters used to identify and authenticate polished precious and semi-precious gemstones..
- Gemological (Gemstone) Refractometer is your primary and most powerful tool in gemstone identification. As with a typical critical angle refractometer, it will measure the Refractive Index of faceted stones..
- This Gemological refractometer is a low cost, lightweight measuring instrument used by jewellers and traders of gemstones to measure polished stones over a refractive index range of 1.30 to 1.81 RI..
- The instrument can also be used to identify whether a particular stone is Isotropic or Anistropic (uniaxial or biaxial)..
- In fact, you can also use this tool to measure R.I. for many minerals in crystal form as long as the crystals have a flat and polished face..
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