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  Indian J Med Microbiol
 

Figure 1: (a and b) Parts of the Goldmann applanation tonometer as seen from the front. 1: Revolving knob with measuring drum; 2: Feeler arm with measuring prism at the top; 3: Weight; 4: Counterweight; 5: Point at which weight is applied to the feeler arm by a rod (6), (c): Undersurface of the Goldmann applanation tonometer. 7: The groove over which weight rotates; 8: The WD40 spray straw

Figure 1: (a and b) Parts of the Goldmann applanation tonometer as seen from the front. 1: Revolving knob with measuring drum; 2: Feeler arm with measuring prism at the top; 3: Weight; 4: Counterweight; 5: Point at which weight is applied to the feeler arm by a rod (6), (c): Undersurface of the Goldmann applanation tonometer. 7: The groove over which weight rotates; 8: The WD40 spray straw