Guildline

Guildline

Guildline Instruments is a Canadian manufacturer of ultra-precision DC electrical measurement and calibration instruments. Founded in the 1950s, the company has established itself as a specialist in high-accuracy reference standards used by national metrology institutes, accredited calibration laboratories, and industrial quality departments worldwide.

Guildline's product line centers on precision DC standards: current shunts, resistance standards, voltage references, and high-voltage measurement systems that achieve uncertainties in the parts-per-million range. Their instruments serve as primary and transfer standards in the most demanding measurement traceability chains, supporting NIST-traceable and BIPM-referenced calibration programs.

Key Product Lines

• Precision DC current shunts for high-accuracy current measurement and calibration
• Transvolt high-voltage DC measurement systems for reference and calibration laboratories
• Precision ohm resistors and resistance standards for calibration use
• DC calibrators and measurement bridges for standards laboratories

Industries Served

Guildline instruments are used in national and accredited calibration laboratories, aerospace and defense metrology, power generation and transmission measurement, semiconductor manufacturing, and any application requiring traceable, ultra-accurate DC electrical measurements.