Nice and easy to use professional level periodic table of the elements. Contains a lot of thermodynamical, material and electromagnetical element data, as well as generic element info. Also isotope information about naturally occurring isotopes is included.
In some variables, user can toggle between different units, for example in temperatures between Kelvin, Celsius and Fahrenheit grades (please see the image below). Also element name is available in 9 languages.
Every variable has also short description.