Display more digits in Manipulate Control Panel

Questions
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1 
Manipulate[NumberForm[a, 7], {{a, 600.0000}, 600 - 0.1, 600 + 0.1, 0.0001,Appearance -> "Open"}]

How does one get the open control panel of Manipulate to display more digits/ format the display inside the control panel?

2

Is this the sort of thing you are interested in? (Note that NumberForm has additional formats that allow control of the digits both to the left and right of the decimal point.)

Manipulate[
 NumberForm[a, {7, 10}], {{a, 600.0000}, 600 - 0.1, 600 + 0.1, 0.0001,
   Appearance -> "Open"}]

--David
http://scientificarts.com