Patent ID: 7244397

Claim:
A digital burette comprising: a manual drive for suctioning and delivering an adjustable dose volume; a gear cooperating with said manual drive; a incremental encoder operatively connected to said gear, said incremental encoder having a sector disc with two groups of sectors having differing magnetic field strengths which are alternately disposed in a peripheral direction of said sector disc; a first sensor sensitive to magnetic fields of said sector disc, said first sensor disposed and configured to detect a rotation and a number of turns of said sector disc; a second sensor sensitive to magnetic fields of said sector disk, said second sensor disposed and configured to detect a rotation and a number of turns of said sector disc, wherein an angular separation between said first sensor and said second sensor differs from an integer multiple of an angle between said sectors of said sector disc; a processor connected to said sensor for calculating a dose volume corresponding to rotation of said sector disc; a digital display device connected to said processor for displaying said dose volume; and at least one solar cell connected to said sensor and to said processor for providing electrical power thereto.