Oh, sorry, I completely misunderstood you. I thought you wanted an indicator that operated on tick data, and you wanted the size of the ticks.
You can get this value from Symbol.SymbolInformation.TickSize. To know which symbol your indicator is being run for, you can implement the ISystemAccess interface in your indicator. Initialize() will be called with a reference to the SystemData object and Symbol.
The catch is that ISystemAccess only works when you are using your indicator as part of system. So if you just want to chart an indicator it won't work. I have made a change so that the Initialize method will be called with the correct symbol when adding an indicator to a chart (the SystemData reference will be null). So in RightEdge 1.2 you will be able to do this seamlessly.