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A heated platen assembly for use in a biological testing device is disclosed having a heated platen defining a plurality of optical openings configured to permit radiation to pass through the heated platen, a light transmissive slip cover configured to cover at least one of the plurality of optical

A heated platen assembly for use in a biological testing device is disclosed having a heated platen defining a plurality of optical openings configured to permit radiation to pass through the heated platen, a light transmissive slip cover configured to cover at least one of the plurality of optical openings, and means for retaining the slip cover over the at least one of the plurality of optical openings.

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What is claimed is: 1. A biological testing device for samples, comprising: a heated platen assembly, the assembly comprising: a heated platen defining a plurality of optical openings, the optical openings configured to permit radiation to pass through the heated platen, the heated platen having a

What is claimed is: 1. A biological testing device for samples, comprising: a heated platen assembly, the assembly comprising: a heated platen defining a plurality of optical openings, the optical openings configured to permit radiation to pass through the heated platen, the heated platen having a first side configured to face away from a plurality of sample wells and a second side configured to face toward the plurality of sample wells, wherein the heated platen is connected to a resistive element; a light transmissive slip cover configured to cover at least one of the plurality of optical openings on the first side of the heated platen; and a frame member over the plurality of optical openings, wherein the frame member overlaps with the slip cover and does not obscure any of the optical openings, and wherein the frame member is attached to the heated platen via holes in the frame member and the heated platen; wherein the heated platen comprises a recessed portion surrounding and retaining the cover slip and the slip cover is adhered to the heated platen; and an optical detection device, the optical detection device comprising a real-time detector of nucleic acid amplification in the samples during thermal cycling; and a light source, wherein both the radiation passing from the light source to the sample wells and from the sample wells to the optical detection device pass through the same optical opening. 2. The heated platen assembly of claim 1, wherein a top surface of the slip cover is substantially flush with a top surface of the heated platen when the slip cover is positioned in the recessed portion of the heated platen. 3. The heated platen assembly of claim 1, wherein the frame member further comprises a recessed portion configured to retain the slip cover in a desired relation to the heated platen. 4. The heated platen assembly of claim 1, wherein the frame member comprises sheet metal. 5. The heated platen assembly of claim 1, wherein the slip cover comprises glass. 6. The heated platen assembly of claim 5, wherein the slip cover has a thickness of approximately 0.5 mm or less. 7. The heated platen assembly of claim 1, wherein the slip cover comprises a non-fluorescing clear polycarbonate. 8. The heated platen assembly of claim 7, wherein the slip cover has a thickness of approximately 0.6 mm to approximately 3.2 mm. 9. The heated platen assembly of claim 1, further comprising a gasket between the slip cover and the heated platen. 10. The heated platen assembly of claim 9, wherein the gasket is positioned between an outer edge of the slip cover and the heated platen. 11. The heated platen assembly of claim 9, further comprising a gasket positioned between a surface of the slip cover facing the plurality of optical openings and an area of the surface of the heated platen surrounding the plurality of optical openings. 12. The heated platen assembly of claim 1, wherein the heated platen defines 4, 8, 12, 24, 48, 96, 384, or 1,536 optical openings. 13. A biological testing device for samples, comprising: a heated platen assembly, the assembly comprising: a heated platen defining a plurality of optical openings, the optical openings configured to permit radiation to pass through the heated platen, the heated platen having a first side configured to face away from a plurality of sample wells and a second side configured to face toward the plurality of sample wells, wherein the heated platen is connected to a resistive element; a light transmissive slip cover configured to cover at least one of the plurality of optical openings on the first side of the heated platen; and a frame member over the plurality of optical openings, wherein the frame member overlaps with the slip cover and does not obscure any of the optical openings, and wherein the frame member is attached to the heated platen via holes in the frame member and the heated platen, wherein the slip cover is adhered to the heated platen; and an optical detection device, the optical detection device comprising a real-time detector of nucleic acid amplification in the samples during thermal cycling; and a light source, wherein both the radiation passing from the light source to the sample wells and from the sample wells to the optical detection device pass through the same optical opening. 14. The testing device of claim 13, wherein the heated platen comprises a recessed portion.