Casella Casella is a global leader in the manufacture and supply of occupational hygiene and environmental monitoring equipment. acquired 2022 Visit Site Real estate investment firm specializing in the acquisition and management of commercial multi-family properties. established 2017 DICKEY-john Corporation is a market-leading supplier of systems used in agricultural, public works and analytical markets. acquired 1987 Visit Site ESC Spectrum is a leading provider of products and services for Electric Power and Petroleum industries, helping to meet air emissions compliance obligations accurately and efficiently. ESC acquired 1999 / Spectrum acquired 2018 Visit Site MSP Corporation is an instrument and equipment company creating products for scientific research and industrial applications. acquired 2016 Visit Site Neil's Parts is a leading provider of non-OEM, after-market, and replacement ag and industrial parts. acquired 1996 Visit Site Tekran Instruments Corporation is the world leader in the design and supply of trace-level mercury monitoring and analytical instruments. acquired 2005 Visit Site TSI Incorporated is an international leader in the design and production of precision measurement instruments. acquired 2000 Visit Site Worthington Tractor Parts and its sister company in Australia, Neil’s Parts, are leading suppliers of agricultural equipment replacement parts. acquired 1986 Visit Site