To get the value of a constant, click the 'const' button to get the constants dialog box. If necessary, select the property and suitable units, then select the desired constant from the Constants list box. When you have selected a constant its value is displayed. If you want to put the value into the calculator display, click OK. To quit without changing the calculator display, click Cancel. Note that for some properties the constants box will be empty because we have not been able to think of any useful constants!
The property, units and constants list boxes each have an adjacent button labeled Edit. To modify the properties database press the Edit button next to the properties, units or constants list boxes as required. A dialog appears which allows you to Add, Delete or Rename units, properties or constants. For constants you can also modify an existing value and for units you can update the factor or offset (for example if you have access to more accurate data). Select the unit, constant or property you want to rename or delete in the listbox.
You can use the Find button to search for a property or units from the properties database. Click on Find and enter the word or part word you are looking for. The first property or unit containing the word will appear in the convert dialog box. Press the Find Next button to find any further occurrences of the word.
You can save your new properties, units or constants by clicking the Save button and giving a file name. You can subsequently load a set of properties, units and constants using the Load button. If you save the file with the name DEFAULT.PRP in the default directory, your file will be loaded automatically in future. The file FACTORY.PRP is the properties file which is supplied with the software and should not be overwritten. If you want to revert to the properties as supplied, simply delete or rename your DEFAULT.PRP file; FACTORY.PRP is automatically loaded if DEFAULT.PRP is absent. If you have saved a lot of data in this way, you might want to make sure you have a backup copy of your DEFAULT.PRP file.