For LibreCAL is an electronic calibration kit for that can be directly called and quickly calibrated in -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: accurate calibration for critical engineering tasks. 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 The product appearance and printed words depending on the batch, but this does not affect use. Colour:As Shown Material:Metal Package Contents: 1 * For LibreCAL 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.