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Table 7: Gravimetric measurement of different quantities of drops under constant conditions.

Number of drops 5000 7500 10 000 12 500 15 000 Number of measurements 15 15 15 15 15 Mean value [mg or L] 0.72 mg 1.12 mg 1.48 mg 1.85 mg 2.24 mg Std. deviation 0.0372 0.0373 0.0312 0.0398 0.0319 % Std. deviation 5.2% 3.3% 2.1% 2.2% 1.4% Visual volume 200 pl 200 pl 200 pl 200 pl 200 pl Visual/gravimetric ratio 1.40 1.33 1.35 1.35 1.34