Guildline Instruments has been the premier supplier of resistance measurement systems and standards to the world’s national laboratories for nearly half a century. Our broad product line encompasses several models of precision resistance standards optimized for particular applications, AC and DC current shunts, air and fluid baths for precise environment control, and automatic measurement systems with a broad range of accessory products.

Resistance Standards
6634A Resistance Standards
6636 High Value Resistance Standards
7334 AC/DC Resistance Standards
9334A High Stability Standards
9336 High Value Resistance Standards
9337 Ultra High Value Standards (1T~10P)
9340 Decade Resistance Standards
9350 Hamon Type Resistance Transfer Standards

Resistance Measurement Instruments
6625A Automated Resistance Measurement System
6622A series of DCC Bridges
6623A Series High Current Range Extenders
6623 DCC Range Extender
66252 DMM Switch
66001 Lead Compensator
6520 Intelligent Teraohmmeter
NEW! 6530 TeraOhm Bridge-Meter
NEW! 6535 Automated High Resistance Measurement System
NEW! 6564 High to Ultra-High Resistance Scanners
6664C Low Thermal Quad Scanner, 1000V max

AC/DC Current Products
9230A DC Current Shunt
NEW! 7340 AC/DC Current Shunts
NEW! 7350 AC/DC Current shunts
7320 AC Current Shunt (Now replaced by the 7350 series)
9200 DC Multiple Standard Resistor
9211A Multivalue Current Shunt
7620 Wideband Amplifier
Model 9910A AC High Voltage Capacitance and Inductance Bridge
99100A Capacitance Reference System
7410 AC Voltage Reference
6623A Series High Current Range Extenders

Temperature Measurement and Control Products
NEW! Model 3210 Thermometry Auto-Switch with Pre-Heat
NEW! 6625T Temperature Measurement System
6622T series of Thermometry Bridges
6623A Series High Current Range Extenders
5030 series of Programmable Precision Air Baths