Use the Lixer S to verify both the push and the pull measurements of most tape measures. The Lixer can be used with both standard and metric tape measures. Using a Lixer, you can calibrate a tape measure's accuracy (see our helpful hints section). Calibration lines are located at 100 mm and at 6". Accuracy +/-.002". All Lixer S come with a Certificate of Traceability to NIST (National Institute of Standards and Technology) valid for 1 year.