Patent ID: 7489403

Claim:
An electronic testing apparatus, comprising: a testing paper, having a first reaction line and a second reaction line; a circuit board, having a light source, a first detector, and a second detector equipped thereon, wherein the light source is disposed between the first detector and the second detector; and a light shelter, defining a first chamber, a second chamber, and a third chamber, wherein there is a first slit configured between the first chamber and the second chamber, and a second slit configured between the second chamber and the third chamber; wherein the first chamber, the second chamber, and the third chamber respectively shelter the first detector, the light source, and the second detector, the first detector detects a reflected light of a light projected by the light source to the first window through the first slit, and the second detector detects a reflected light of the light projected by the light source to the second window through the second slit.