Accuracy small numbers converted to symbolic

Any idea how to eliminate the inaccuracy occuring when converting small numbers to symbolic:

Current Example:

>> sym(2e-6)

ans =

4722366482869645/2361183241434822606848

>> sym(2e-5)

ans =

1/50000

Answer 1

[Walter Roberson]

sym('2e-6')

ans = 

0.000002

sym(2)*10^(-6)

ans = 

[Martin Baumann]

Thank you Walter, great idea and does the trick. Regards, Martin