For LibreCAL is an electronic calibration kit for LibreVNA that can be directly called and quickly calibrated in LibreVNA-GUI, eliminating the tedious manual operation of using mechanical calibration kits. Electronic calibration kits cannot perform isolation calibration. If necessary, mechanical calibration kits can be used to manually add isolation calibration. High accuracy: Ensure accurate calibration for critical engineering tasks. Durable construction: Built to withstand rigorous use in a variety of environments. Ideal for telecommunications, broadcast, and research facilities, for LibreCAL kits provide the reliability needed for complex network analysis. Applicable:for LibreVNA The product appearance and printed words may vary depending on the batch, but this does not affect use. Colour:As Shown Material:Metal Package Contents: 1 * For LibreCAL LibreVNA Matching Electronic Calibration Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.