BIRO Schioetz-Tonometer

High-quality agate bearing for extremely long service life.
Precision measurement on a scale of 0 to 20 subdivisions and 0 to -1 sub-divisions.
Perfect reading of the scale with red pointer. Supplied with three weights (5.5 g, 7.5 g, 10 g) and a conversion table.
All vital parts are made of Aluminium, other parts are BRASS chrome-plated Complete in case.
Complete Set in Deluxe Case with User Manual