Guildline Instruments Limited is a Canadian owned product development and manufacturing company located in Smiths Falls, Ontario, Canada. The company can claim a track record and an outstanding reputation unparalleled in the field of electrical metrology. Its origins date back to 1951 when a well known English precision instrument manufacturer, H. Tinsley & Co. Ltd. opened a North American facility at St. Jerome, Quebec, Canada. However, market performance failed to live up to expectations, and the decision was made to close the North American operations. A group of employees wished to remain in Canada, and they purchased the manufacturing rights from Tinsley and set up a company which was incorporated in 1957 as Guildline Instruments Limited.

By the early 1960's new and innovative products had replaced most of the Tinsley line and Guildline had established its own identity as a precision instrument manufacturer. It was during this period that a close liaison with Canada's National Research Council (NRCC) was established. Not only did Guildline benefit by becoming an important supplier to the NRCC laboratories, but several technical breakthroughs by NRCC were used in new Guildline products. One of these, the DC current comparator principle has been used in as many as six of the company's products. In 1967 two of these, the resistance and voltage comparators were awarded the prestigious U.S. Industrial Research Award as one of 'the most significant new products of the year. 'Today, the model 6675A Programmable Resistance Bridge utilizes this same basic technology and is justifiably regarded as the most accurate resistance bridge commercially available. Our latest product, the model 6625 Automatic Resistance Measurement System, is the latest in an ongoing product development program dedicated to bringing the most precise and productivity enhancing products to the workplace. The United States Air Force has approved the purchase of a significant number of these systems. Those products exemplify the principle to which the company is committed - to produce long term solutions to high level metrology applications.

Guildline supplies metrology instruments and standards to the national standards laboratories, industrial and educational facilities, through distribution, in more than 55 countries. Our presence in these laboratories is due in part to the fact that today's standards laboratories are required to make measurements well outside the precision and accuracy of conventional potentiometers and digital instruments. To satisfy these requirements, Guildline manufactures a broad range of metrological instrumentation including Voltage References (both AC and DC), AC/DC Transfer Standards, Resistance Standards, Resistance Calibrators, Nanovoltmeters, Teraohmmeters, Precision Wattmeters, Transconductance Amplifiers, and Resistance and Current Bridges. All of these instruments utilize state-of-the-art technology, and most are equipped with computer interfaces such as GPIB and RS -232C, enabling their control and operation from remote computer terminals.

Early in the 1970's, Guildline established an Ocean Products Division and obtained licensed manufacturing rights for several NRCC designs for oceanographic temperature and conductivity sensors for use in high resolution data acquisition probes designed and manufactured by Guildline. The company has continued to produce oceanographic instrumentation since that time, and has maintained research and development in the oceanographic field to provide state-of-the-art instrumentation to marine scientists and oceanographers. One of these instruments, the model 8400 Autosal series laboratory salinometer, has become the de facto world standard for conductivity comparisons of ocean water samples. In common with the metrological in conjunction with the latest microprocessor technology to provide instrumentation that is easy to use yet capable of providing measurements comparable to those previously attainable only manually and by the most exacting and experienced metrologists.

Guildline's blend of craft and technology is unique in the business. The sophisticated instrumentation and the subsequent 'niche' market required for metrology dictates that the company operates on a global level. Guildline currently exports more than 95% of the products it manufactures. The single largest market is the United States and is represented by Guildline Instruments Inc., (who was Guildline's affiliate from 1969 to May 2000 and is now an independent corporation) in Lake Mary, Florida, local Canadian service and calibration for the U.S. handled from the Guildline Instruments Inc. facility. The Canadian, European, African, Central/South American and Asia/Pacific markets are serviced from the Canadian facility and have been developed to the point where both the European and Asian sectors are each beginning to rival the U.S. market for largest sales revenue producer. Other locations are being considered for the establishment of products service and support centers.