Pico Technology SOLT-PREM-M

Calibration and measurement reference standards. 
Pico Technology also offers two short, open, load and through (SOLT), 4-piece, 5-port calibration kits in both male and female genders.
All kits have high-performance tight-tolerance stainless steel interface connectors.
Kits are supplied as an assembled five-port "Y" SOLT, either male or female. They can be disassembled for individual usage, or for economical refurbishment should a calibration standard be damaged.
Each SOLT is supplied with calibration data linked to the kit serial number and is supplied in a protective carry case.
Both the Standard and Premium kits offer exceptional residual directivity for the price. It is this that combines with good uncorrected port match on the PicoVNA 106 and PucoVNA 108 to deliver exceptional price-performance.
Premium PC3.5 kits are calibrated to reduced uncertainty using TRL (through, reflect, line) intercomparison above 1.5 GHz.
All kits are calibrated against fully traceable PC3.5 standards.
See Pages 4 to 7 on the datasheet, if you need help to choose the correct cal kit and cables, adaptors that fit your application.