MJ-120GST is one of the world’s first calculator with 5 dedicated keys for GST Calculations for different GST slabs. These 5 keys are pre-configured with current GST slabs i.e. 0%, 5%, 12%, 18% and 28%. You can also change the assigned GST rates if need be. Now calculating value with or without GST, for any slab, is very easy and fast.