Highly precise eye tonometer according to Prof. Schiötz for measuring intra-ocular pressure. Its reliability and durability makes this quality measuring instrument indispensable in every ophthalmologist's practice and eye clinic. 
 

Precision measurement on a scale of 0 to 20 subdivisions and 0 to -1 sub-divisions.  Supplied with three weights (5.5 g, 7.5 g, 10 g) and a conversion table.