P. L. Tandon & Co. Offers Bulk Density Appts Densitometer. P. L. Tandon & Co. Is an ISO 9001 2000 certified company, manufacturing laboratory instruments. The Bulk density Appts Densitometer is made for observing the packing down of powder beds of various powders fitted with digital counter facility. It can start automatically to attain the pre-set strokes. It comes without Graduated Glass Cylinders of 50/100 ml capacity.