The Model 331 has been replaced by the Model 335

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p_sensors Cryogenic Temperature Sensors
​Measure temperatures from <20 mK to over 1,500 K. A wide selection of diodes, RTDs, thermocouples, and mounting packages are available.
p_bridge AC Resistance Bridges
​Designed for precise, accurate, low noise, low excitation power AC resistance measurements. Measure resistance materials in cryogenic environments from <20 mK to 1 K.
p_monitors Cryogenic Temperature Monitors
​Monitor temperatures from 1.4 K to over 800 K. Choose from one or eight standard inputs. USB, IEEE-488 and RS-232C interfaces, relays, and analog outputs available.
p_Accessories Cryogenic Accessories
​Cryogenic and temperature measurement accessories include cable, wire, solder, heaters, insulating and conductive materials, and more.