S Di Engineering Corporation Established as a Proprietor firm in the year 1999 at Rajkot (Gujarat, India), we “S Di Engineering Corporation” are a leading Wholesale Trader of a wide range of Hardness Tester, Electronic Testing Machine, Weighing Balances, etc. We procure these products from the most trusted and renowned vendors after stringent market analysis. Further, we offer these products at reasonable rates and deliver these within the promised time-frame. Under the headship of “Mr. Dipak N. Modi” (Proprietor), we have gained a huge clientele across the nation.