Parees Tech Instruments Private Limited Parees Tech Instruments Private Limited was edstablished in the year 2009. Parees Tech is founded by Engineers and technocrats with over 50 years of combined experience in the field of Nano Technolgy, Electron Microscopy, Material/Polymer Testing etc. Modular co-rotating twin-screw extruders available with clamshell barrels and our unique high tool steel barrel inserts. With screw diameters of 16, 20 and 26 mm and L/D ratios up to 44. Suitable for laboratory, research and small batch productions.