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HM Digital - Water Quality Testing Instruments
Water testing instruments for residential and commercial purposes. Instruments check tap water or monitor water purification systems. Inline and handheld TDS meters, reverse osmosis and filter monitors, precipitators, controllers.
www.tdsmeter.com/

A Study of Drinking Water Quality in the US
Report on a student project that tested water samples from locations around the country.
www.geocities.com/

Center for Environmental Quality
Free information on common water quality problems and treatment techniques.
www.water-research.net/

OpTest Equipment, Inc
Canada. Manufactures lab and on-line quality control equipment for the pulp, paper, and board industry. Site incorporates detailed product information, most of it in downloadable form.
www.optest.ca/

Apogee Systems, Inc
USA. Design and manufacture of quality and process control, evaluation and analyzing systems for the pulp and paper, printing and converting, and transportation industries. Extensive technical information.
www.apogeesystems.com/

Ghaziabad Technocrate Consultants Pvt., Ltd
India. Design and manufacture of monitoring, guidance and testing instruments and control systems for the pulp and paper industry. Also, auxiliary equipment. Consultants for turnkey projects. Maintenance and repair services. On-line job offerings.
www.gtcinstruments.com/

aBell Engineering
USA. Distributors and manufacturers' agents of testing equipment for producers and converters of paper, film and foil products. Also, consultancy and training services, and maintenance and repair assistance.
www.abelleng.com/

Adirondack Machine Corp
USA. Manufacturers of laboratory equipment for the pulp and paper industry, paper recycling and chemical companies, and universities. Extensive technical information. Links to related sites.
www.adirondackmachine.com/

Rad Elec - EPERM Detectors
Manufactures Passive Integrating Electret Ionization Chambers for measuring ionizing radiation (alpha, beta, gamma, neutrons) and radioactive gases (radon, thoron). Mainly for professionals.
www.radelec.com/

Resonic Technology Inc.
Manufactures non-destructive test equipment for the metalworking industries. Site describes the use of electro-magnetic acoustic transducers in testing metal parts, metal fasteners, and wire products.
www.resonic.com/