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..
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..
