Have a digital manometer has functions of InH2O, psi, Mbar, kPa, inHg, mmHg ?? Which one to use to test draft on my chimney ? What would the proper test procedure? When stove and pipe are cold/ hot? Bypass with cat engaged or not? Stove top Temp? How far to stick probe into pipe and keep it level or tilt it upward toward top of chimney ? What should I expect with a interior insulated 8 x 35 foot SS ??