This pressurecast light metal level has two milled measuring surfaces It is robust & very practical its two handholds make it very comfortable to use The horizontal vial can be read from all four sides & both the vertical vials from three sides whether in normal position or overhead With an additional angle finding vial The second vertical vial can be rotated so that you can determine the angle of the inclination that you are measuring Measurement accuracy in the normal position 0029 05 mmm For overhead measurements 0029 05 mmm Angular measurement tolerance A 03 Length 800mm 32in