OTS Calibration Laboratory is Bangladeshâ€™s first & only accredited calibration and repair lab. OTS diverse calibration scopes cover mechanical, dimensional mass & volume, pressure & vacuum for clients across variety of industries. Our four environmentally controlled labs are sophistic-ally equipped to offer fast turnaround on most jobs. Onsite service is also available. Are you sure your instruments are taking accurate measurements and can stand up to any inflectional or auditing process? With OTS you will be.