OTS Calibration Laboratory is Bangladesh’s first & only accredited calibration and repair lab.  OTS diverse calibration scopes cover mechanical, dimensional mass & volume, pressure& vacuum calibrations for clients across variety of industries. Our four environmentally controlled labs are sophistic-ally equipped to offer fast turnaround on most jobs. Roopokar Creative Studio is one of the best website company has developed the OTS site with extreme care and dedication. We primarily use the orange and white color. The dropdown menus are very clean and sharp easy to navigate all over the site. The back end PHP and Html language has been use very proficiently in especially dynamic and real time e-mailing and so on.