GST rate for a particular product can be checked by consulting the invoice provided by the distributor. The invoice should clearly indicate the GST rate applicable to the product, as well as the GST amount charged on the product.

It's a good idea for new businesses to familiarize themselves with the GST laws and rates in India, as this will help them to accurately track their GST obligations and ensure that they are in compliance with the law. It is also advisable to keep accurate records of all purchases made, including invoices and receipts, in order to be able to claim input tax credits (ITCs) on GST paid on inputs.

If you are using accounting software to manage your GST obligations, you can enter the GST rate and amount applicable to a particular product when you upload the purchase invoice into the software. This will help you to accurately track your GST obligations and ensure that you are in compliance with the law.