Highly transparent. With easily readable, molded, embossed blue graduations and ring marks at the primary scale points. Calibrated ‘In’. Class B tolerances according to DIN 12681 / ISO 6706. Hexagonal base with bottom studs provides high stability. Thermal stress up to 80 °C does not cause tolerance limits to be permanently exceeded. To preserve markings. do not clean at temperatures exceeding 60 °C.