Martin E. Geisel

ISS Facility Services Holding GmbH provides facility management services. It offers cleaning, security, technical, catering, and support services. The firm specializes in the retail and wholesale trading, energy, health care, industrial and manufacturing, food, pharmaceutical, as well as transportation and infrastructure industries. The company was founded on June 1, 2006 and is headquartered in Dusseldorf, Germany.

Part of ISS A/S, ISS Communication Services GmbH is a German company that provides communication services. The company is based in Dusseldorf, Germany. The company was founded in 2017. Christian Steen Larsen has been the CEO of the company since 2019.

Hach Lange GmbH engages in the manufacture and development of water analysis products and services. It provides cuvette-testers and accessories, titration testers, visual testers, microbiological testers, luminescence testers, laboratory cases, sample preparation products, photometers and accessories, electrodes and meters, turbidimeters, thermostats and printers, titrators, lab automation instruments, and ECM accessories for laboratory applications. The company was founded in 1933 and is headquartered in Dusseldorf, Germany.

Fluke Corp. manufactures and distributes electronic test tools and software. The firm's products include test tools, accessories, battery analyzers, bench instruments, clamp meters, data acquisition, digital millimeters, earth ground, electrical testers, fluke calibration, and fluke connect. The company was founded in 1948 and is headquartered in Everett, WA.

INAX AG provides software integration and networking solutions for alarm server management.

Leica Microsystems GmbH develops and manufactures high precision optical systems. Its products includes microscopes and imaging solutions, modular microscopers for needs. The company was founded in 1849 and is headquartered in Wetzlar, Germany.