How to check field value is numeric or character?

Question

Delphi

Please tell me how to check the received field value is numeric or character.
Type of the following code, the code not working, for an example resulted:
var
varVariablePole : String;
begin
varVariablePole := ExcelApp.Range['A'+IntToStr(varCounter)];
if not (varVariablePole in ['1'..'0']) then varP_visible := 0;

Answer 1

use TryStrToFloat

Answer 2

possible via
if Pos('.', varVariablePole ) > 0 then
ShowMessage('Point found')