Guildline Instruments manufactures and markets ultra-precise instruments for the fields of metrology and oceanography. Our products are used for research and as the primary instrument with respect to establishing traceability to fundamental electrical standards. Key customer markets include national research laboratories, national metrology institutes, militaries, nuclear power plants, aerospace, and companies in the electrical and power industry. Most Guildline instruments are unique and represent the only commercially available instrument capable of accuracy in the sub parts-per-million range. The team of Guildline engineering and manufacturing experts is recognized around the world for the performance and quality of the Company's products. Many of these instruments were, and continue to be, developed in conjunction with government research institutions such as the National Research Council of Canada (NRCC).

Guildline manufactures a broad range of metrological instrumentation including: Quantum Hall Systems, Resistance and Thermometry Bridges, Teraohmmeters, Ultra-Stable DC High Current Sources, the world's best DC Current Shunts, DC Voltage Dividers/References, Resistance Standards (both DC and AC), Power Analyzers, Wide Frequency AC Current Shunts, Transconductance Amplifiers, Fluid/Oil Baths, Air Baths, and the most advanced Automated Measurement Systems with a broad range of accessory products. Guildline also builds the world's best salinometers! Our calibration laboratory provides some of the best uncertainties commercially available, is ISO 17025 accredited, and can calibrate both Guildline and other manufacturers' equipment.

Guildline's instruments provide our customers with the widest range, best accuracies, and best uncertainties of any manufacturer. Our world-class engineering team continues to introduce many new innovations into electrical metrology instruments. In the past 7 years Guildline has been granted or filed for more than 17 patents. Our new products are designed to be modular and expandable. Thus customers can order an instrument with the range of operation and uncertainties to meet existing requirements, but be assured that they can expand the capability of their Guildline instruments to meet future needs. In addition, expanded features, analysis and display options, and utilities to automate calibration procedures are provided with all of our newer instruments. This functionality provides additional value-add to our customers and is not matched by other electrical metrology companies.