A traceable ruler for magnification verification is an essential part of many quality control programmes. The Micro-Ruler MR-1 is a metric dimensional calibration product to fulfil this purpose. One significant use of the MR-1 is to measure magnified images to determine absolute magnification.
The MR-1 ruler is manufactured using accurate semiconductor fabrication equipment. The pattern is anti-reflective chromium over soda lime glass. The overall size is 180 x 25 x 3mm and it is labelled in millimetres, with the scale extending over 150mm with 0.01mm increments. The linear expansion coefficient is 9 x 10-6 ppm/°C and, over its full 150mm length, the ruler could change dimensions by 1.35µm/°C. It has been designed to be viewed from either side, as the markings are both right-reading and mirror images, allowing the ruler markings to be placed in direct contact with the sample and avoiding parallax errors. The ruler uncertainty is ±0.5µm over 0 to 10mm length and ±2.5µm over the entire 150mm length.
The ruler also has circles and squares of 0.02, 0.05, 0.01, 0.05, 1.00, 2.00 and 5.00mm diameter and side length.
We offer the MR-1 only as a certified traceable reference standard and recommend recertification at five yearly intervals.
Price is individual, so please contact us in order to receive more information.
