HAAPCOL incorporation with Instrotek, Inc., supplies Nuclear Density Gauges, along with the calibration services of the same. Based in the USA, InstroTek, Inc. offers a number of products and services for Nuclear Gauges.

Furthermore, InstroTek offer the highest level of gauge calibration service in the industry, meeting ISO Standard 17025.  InstroTek manufactures a variety of CPN gauge models themselves and also have a variety of innovative field and laboratory products.