Patent ID: 7508498

Claim:
An apparatus, comprising: a point light source; a photodetector; a lens, positioned in the same side of said point light source and said photodetector, said lens configured to focus a light from said point light source onto a target area of an object through said lens, and further configured to focus a reflected light from said target area of said object onto said photodetector through said lens; wherein said object comprises a test strip comprising a light-absorbing area configured to occur in response to a specific component of a tested solution contacting therewith and further configured to absorb said light emitting from said point light source; and wherein said point light source is configured to radiate a light with a first wavelength and a light with a second wavelength, wherein said tested solution contained in said light-absorbing area of said test strip is configured to absorb said light with the first wavelength, wherein a sampling amount of said tested solution is determined in accordance with the reflectance of said light with the first wavelength from said light-absorbing area, wherein said light-absorbing area is configured to occur in response to said specific component of said tested solution and is further configured to absorb said light with the second wavelength, and wherein a content of said specific component is determined in accordance with the reflectance of said light with the second wavelength from said light-absorbing area.