Calibration standards are essential to VNA performance and should be chosen carefully, as they are a major source of measurement uncertainty. Even small wear or damage can affect accuracy, so users often use premium-grade standards for calibration and reference, and standard-grade units for routine use. Pico Technology offers 50 Ω SOLT calibration kits in male and female versions, built with high-precision stainless steel connectors. Each kit is supplied as a 5-port assembled SOLT and can be disassembled for individual use or refurbishment if needed. All kits include traceable calibration data linked to the serial number and are supplied in a protective carry case.