P. L. Tandon & Co. Offers Walk-In Incubator. P. L. Tandon & Co. Is an ISO 9001 2000 certified co. And manufactures laboratory instruments. The Walk-In Incubator features a double walled design with aluminium or S.S. Made inner chamber and M.S. Made outer chamber. It digitally controls temperature from 5 deg C above room temperature to 60 deg C. The inner size of this Walk-In Incubator is 1100 x 2300 x 1000 mm.