Manufacturer profile

About Guildline

Reviewed 2026-07-26

Guildline Instruments Limited is a Canadian designer and manufacturer of primary-level electrical and temperature metrology equipment. Its instruments and standards are intended for national metrology institutes, calibration laboratories, research organizations, and other users that require traceability and very low measurement uncertainty.

History

Guildline states that it has designed and manufactured metrology-based electrical instruments and standards since 1957. The company describes its equipment as primary standards and measurement systems used for research, calibration, manufacturing support, and establishing traceability to fundamental electrical standards. That focus distinguishes Guildline from general industrial instrument suppliers.

Its portfolio spans quantum Hall systems, resistance and thermometry bridges, high-resistance meters and bridges, precision current sources and shunts, voltage dividers and references, resistance standards, power analyzers, transconductance amplifiers, temperature baths, and automated measurement systems. Guildline also makes salinometers, extending its precision-measurement work into oceanography.

The current company contact page identifies Guildline Instruments Limited's headquarters at 21 Gilroy Street in Smiths Falls, Ontario, Canada. Guildline continues to market instruments for primary electrical metrology and temperature measurement, including resistance bridges, resistance standards, current standards, and complete measurement systems. This draft leaves ownership blank because the official pages reviewed do not state a parent or independent ownership status.

Equipment specialties

  • Primary electrical metrology
  • Resistance and thermometry bridges
  • Resistance, current, and voltage standards
  • High-resistance and high-current measurement
  • Temperature metrology systems
  • Salinity measurement

Sources

Guildline document library

This manufacturer library groups 83 public technical documents across 75 models. Use the model list to find service manuals, calibration guides, user manuals, datasheets, and other preserved references for Guildline equipment.

3210 Series 1 document
Datasheet
5010 Programmable Fluid Bath 1 document
Datasheet
50103 1 document
Datasheet
5030 Series High Precision Variable Temperature Air Bath 1 document
Datasheet
5150 Thermometer 1 document
Datasheet
5600 Series High Precision Variable Temperature Fluid Baths 1 document
Datasheet
6500A 1 document
Datasheet
6520 2 documents
User ManualDatasheet
6530 Teraohm Bridge-Meter 1 document
Programmers Manual
6530 Series TeraOhm Bridge-Meter 1 document
Datasheet
6535 High Resistance Measurement System 1 document
Brochure
6564 1 document
Datasheet
66001 1 document
Datasheet
6622A Series 1 document
Brochure
6622A-XPS Direct Current Comparator Bridge 1 document
Datasheet
6622T Series 1 document
Datasheet
6623A Series 1 document
Brochure
6623A-PCS Precision Current Source 1 document
Datasheet
6624CT-3000 Precision High Current DC Transformer System 1 document
Datasheet
66252 DMM Switch 1 document
Brochure
6625A Resistance and Current Measurement System / Resistance Measurement System 2 documents
Brochure
6625A-QHR Quantum Hall Resistance System 1 document
Datasheet
6625T Series Temperature Measurement System 1 document
Brochure
6634A Series Temperature Stabilized Resistance Standards 1 document
Datasheet
6634TS Temperature Stabilized Traveling Resistance Standard 1 document
Datasheet
6636 Series Temperature Stabilized Resistance Standards 1 document
Datasheet
6640T 1 document
Brochure
6664B 1 document
Datasheet
6664C 1 document
Datasheet
6675A 2 documents
Datasheet
7223CT-2S 1 document
Datasheet
7320 Series AC Current Shunts 1 document
Datasheet
7330 Series Resistance Standard 1 document
Datasheet
7334 Series AC/DC Precision Resistance Standards 1 document
Datasheet
7340 Series Precision AC Current Shunts 1 document
Datasheet
7350 Series Precision AC and DC Current Shunts 1 document
Datasheet
7410 1 document
Datasheet
7620 1 document
Datasheet
8400B 1 document
Datasheet
8410A Portasal 1 document
Datasheet
8820A MiniBAT 1 document
Datasheet
9200 DC Multiple Standard Resistor 1 document
Datasheet
9211A Precision DC Current Shunt 1 document
Datasheet
9211B Precision DC Multi-Tap Current Shunt 1 document
Datasheet
9230A DC Current Shunt 1 document
Datasheet
9230A Series Precision DC Current Shunt Standards 2 documents
Datasheet
9330 Series Standard Resistors 1 document
Datasheet
9334A Resistance Standards 1 document
Datasheet
9334A Series Air Resistance Standards 2 documents
Datasheet
9336 & 9337 Series Precision High Value Air Resistance Standards 2 documents
Datasheet
9340 Decade Resistance Standards 1 document
Datasheet
9340 Series Precision Decade Resistance Standards 1 document
Datasheet
9340-4T Series Precision Resistance Standards 1 document
Datasheet
9350 Series Hamon Type Resistance Transfer Standard 1 document
Datasheet
9540 Digital Platinum Resistance Thermometer / Digital Thermometer 3 documents
DatasheetUser ManualService Manual
9540/B 1 document
Service Manual
9730CR Constant Temperature Oil Bath 1 document
Datasheet
9730CR4 Large Volume Constant Temperature Oil Bath 1 document
Datasheet
9732VT Bench Type Constant Temperature Oil Bath 1 document
Datasheet
99100A Capacitance Reference System 1 document
Datasheet
9910A 1 document
Datasheet
9923 1 document
Performance Verification
9975 1 document
Service Manual
AR100 1 document
User Manual
CD Series 1 document
Datasheet
Guildline 6500 1 document
Calibration Manual
LD Series 1 document
Datasheet
LionMount KF Series 1 document
Datasheet
Model 6500 1 document
Service Manual
Model 6520 1 document
Datasheet
Model 6623 1 document
Datasheet
Model 6664C 1 document
Datasheet
Model 9975 Thermometer Bridge 1 document
Instruction Manual Addendum
RD Series 1 document
Datasheet
SR1050 Series Precision Resistance Transfer Standards 1 document
Datasheet