please advise

Dear rajiv,

Cenvat Credit is available only in case where an product is manufcatureed and sold or any output service is provided. In other words credit is available where any duty on output is paid or service tax is paid on output services.

  In your case you are not manufacturing any product. You charge fee from your customers which goes to show that you are providing certain service to your customers. Now the question comes that whether your service is taxable under service tax laws or not. If the answer is yes then is your turnover is more than Rs 10 lacs per annum. in that case machinery / equipment i.e wheighmachine shall be considered as capital good for you and what ever duty has been paid by you on it would be vailable as CENVAT credit. Note that in the above situation you will have to pay the Service Tax.   

Regards

There appears to be no exemption to my knowledge for you in this case.