it is not an exact answer to the question asked. But
we might use similar logic for seeing the smaller
fraction.
For example a1-cell formula is 0.00001
and we are screening as 0
the range for showing non zero solution is 0.001
the in a2=a1*10=0
a3=a2*10=0.001
so by this way we can find the exact number.
However this is laborious and might not be effective
if you want to apply.