road force balancer is a wheel balancer with an additional roller that presses onto the tire - it simulates the load of the car on the wheel - this way it can detect hidden defects and problems too.
The tire needs to be mounted at its marked point (both wheel and tire should have husband marks) and it is then filled and installed to be checked - a variation of more than 20lbs throughout which cannot be remedied means a bad tire.
I believe large dealers should have one or the Michelin local agency in Pakistan.