Below are listed some companies that you might want to consider when designing computer or calculator-interfaced experiments. Often, the hardware and the software you will need will come as a package or in obviously related products. It would be very difficult for us to list all of the products that these companies offer; your best bet would be to look at their on-line catalogs, to which we provide hyperlinks. 

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• Acculabs Products Group
• Products for computer interfacing and CBL applications. Education- friendly.
• 614 Scenic Drive, Suite #104
  Modesto, CA 95350
• (209) 522-8874
• Fax: (209) 522-8875

• Data Harvest Educational
• Probe systems with a variety of sensors and logging systems for educational applications.
• 255 Coopers Ave., Unit 110
  Tonawanda, NY 14150
• (800) 436-3062
• Fax: (905) 607-3469
• Email: craig@dataharvest.com

• DATAQ Instruments, Inc.
• PC computer interfacing. Mostly industrial, but the $24.95 DI-194RS demonstration would meet some educational users' needs.
• 150 Springside Drive, Suite B220
  Akron, OH 44333
• (800) 553-9006
• Fax: (216)666-5434

• Keithley Instruments, Inc.
• PC computer interface hardware and software. Industrial orientation, but many products fit academic budgets.
• 28775 Aurora Road
  Solon, OH 44139
• (800) 552-1115
• (440)248-0400
• Fax: (440)248-6168
• Email: product_info@keithley.com

• Labtronics Inc.
• Systems for collecting data from a wide variety laboratory instruments.
• 95 Crimea St.
  Guelph, Ontario N1H 2Y5
• (519) 767-1061
• Fax: (519) 836-4431
• Email: email@labtronics.com

• Measurement Computing
• This company provides a variety of data acquisition systems, including very simple and inexpensive ones that interface through USB ports.
• 10 Commerce Way
  Norton, MA 02766
• (508) 946-5100
• Fax: (508) 946-9500
• Email: info@measurementcomputing.com

• MeasureNet Technology, Ltd.
• Networked data acquisition systems that move the PC off of the laboratory bench.
• 1776 Mentor Ave.
  Cincinnati, OH 45212
• (866) 396-6765
• (513) 396-6765
• Fax: (513) 351-0610
• Email: info@measurenet-tech.com

• MicroLab
• Interfaces and sensors for temperature, pH, light, pressure, drop counter, and others.
• P.O. Box 7358
  Bozeman, MT 59771-7358
• (406) 586-3274
• Fax: (406) 586-3582

• MicroRidge Systems
• WedgeLink takes data from the serial port into software applications.
• P.O. Box 3249
  Sunriver, OR 97707-0249
• (541) 593-3500
• Fax: (541 )593-5652

• National Instruments
• This company produces high-end data acquisition and automation equipment, mostly for industrial users.
• 11500 N. Mopac Expressway
  Austin, TX 76759-3504
• (512) 794-0100
• Fax: (512)683-8411
• Email: info@ni.com

• PASCO Scientific
• Education-friendly! Specializes in interfaced science experiments and demos.
• 10101 Foothills Blvd.
  P.O. Box 619011
  Roseville, CA 95661-9011
• (800) 772-8700

• TAL Technologies
• Specializes in interfaces to the serial port.
• 2101 Brandywine Street
  Suite 102
  Philadelphia, PA
• (800) 722 6004
• (215) 763-7900
• Fax: (215) 496-0322

• Texas Instruments
• Calculator and computer interfaces.
• (800) 842-2737
• Email: ti-cares@ti.com

• Vernier Software & Technology
• Specializes in interfaces between computers/calculators and laboratory experiments.
• 13979 SW Millikan Way
  Beaverton, OR 97005-2886
• (503) 277-2299
• Fax: (503) 277-2440
• Email: info@vernier.com