Easiest way to calculate gst of all slabs very precisely in a split second. After using this for a month i am writing this review. Here are some pros and cons. 1. Its very acturate. 2. Buttons are very tactile. 3. Easy to use GST values. 4. GST values i.e 0%, 5%,12%,18%,28% already set as defult. 5. We can change the GST values whenever we want. There is only one con to mention that is the brightness of the display which is very dull..Beside this ..itz an amazing product..👍🤗..