IET Labs inc has recently purchased the esi Resistance Line from Tegam.

IET Labs Inc. has acquired certain resistance products, from TEGAM. This represents a significant portion of the products TEGAM acquired from esi, Electro Scientific Industries, in 1993.
IET Labs has well over thirty years of experience with resistance standards and decades and for many years has been a competitor with TEGAM and esi.  IET plans to restore and grow the market position that the esi line has had in the past. IET will expand the mix by offering many more cost effective and tighter specification products to the existing IET/GenRad product lines.
IET will pay particular attention to customers' specialized needs by providing sales, maintenance, and customer support for all current products and all products which are currently in use by customers.

Of particular importance is the addition of the esi SR102 and SR104 Primary Resistance Standards, which are the highest performing resistance standards available.  IET already has the highest performing Capacitance Standards (GR-1404 Series) and the highest performing Inductance Standards (GR-1482 Series). With the addition of the SR102/104, IET is now truly the World Standard in Metrology.