At this website, the UK's National Measurement Laboratory offers beginner guides to introduce important features and concepts of measurement for the areas of acoustics, atomic time, color, computing and measurement, electricity, ionizing radiation, length, light, mass, materials, temperature, and traceability and uncertainty. Each guide contains concise, intelligible descriptions along with helpful illustrations. Visitors can find additional information about the history of length and units of measurement. Students and educators can obtain copies of these guides as posters.