Elongated incubation trough (IR), having an indentation (V) open toward a top end (OS) of the incubation trough (IR), extending along a longitudinal direction of the incubation trough (IR), as well as a bottom (B), which bounds the indentation (V) toward a lower end (US) of the incubation trough (IR), wherein the indentation (V) has a first receiving area (A1) to receive an elongated test strip (T), wherein the indentation (V) moreover has a second receiving area (A2) to receive an end section (EA) of a fluid line (FL), the second receiving area (A2) being in fluidic communication with the first receiving area (A1), wherein moreover a width (BR2) of the second receiving area (A2) at bottom height (BH) is greater than a width (BR1) of the first receiving area (A1) at bottom height (BH), wherein the bottom (B) is formed along a two-dimensional bottom plane (BE), characterized in that , moreover, a lateral boundary of the first receiving area (A1) is formed along the longitudinal direction by two respective, mutually facing longitudinal walls (W1, W2), wherein at least one of the longitudinal walls (W1) runs at a slant to the bottom plane (BE) such that the first receiving area (A1) narrows from the top end (OS) toward the bottom (B), moreover in that both of the longitudinal walls (W1, W2) are slanted to the bottom plane (BE), so that the first receiving area (A1) has a cross section (Q) with a conical extent from the top end (OS) to the bottom plane (BE), moreover in that a lateral boundary of the second receiving area (A2) is formed by two respective, mutually facing longitudinal walls (W11, W12), wherein both of the longitudinal walls (W11, W12) run at a slant to the bottom plane (BE) such that the second receiving area (A2) narrows from the top end (OS) toward the bottom (B) and such that the indentation (V) in the second receiving area (A2) has an aperture angle. having an indentation (V) open toward a top end (OS) of the incubation trough (IR), extending along a longitudinal direction of the incubation trough (IR), as well as a bottom (B), which bounds the indentation (V) toward a lower end (US) of the incubation trough (IR), wherein the indentation (V) has a first receiving area (A1) to receive an elongated test strip (T), wherein the indentation (V) moreover has a second receiving area (A2) to receive an end section (EA) of a fluid line (FL), the second receiving area (A2) being in fluidic communication with the first receiving area (A1), wherein moreover a width (BR2) of the second receiving area (A2) at bottom height (BH) is greater than a width (BR1) of the first receiving area (A1) at bottom height (BH), wherein the bottom (B) is formed along a two-dimensional bottom plane (BE), characterized in that , moreover, a lateral boundary of the first receiving area (A1) is formed along the longitudinal direction by two respective, mutually facing longitudinal walls (W1, W2), wherein at least one of the longitudinal walls (W1) runs at a slant to the bottom plane (BE) such that the first receiving area (A1) narrows from the top end (OS) toward the bottom (B), moreover in that both of the longitudinal walls (W1, W2) are slanted to the bottom plane (BE), so that the first receiving area (A1) has a cross section (Q) with a conical extent from the top end (OS) to the bottom plane (BE), moreover in that a lateral boundary of the second receiving area (A2) is formed by two respective, mutually facing longitudinal walls (W11, W12), wherein both of the longitudinal walls (W11, W12) run at a slant to the bottom plane (BE) such that the second receiving area (A2) narrows from the top end (OS) toward the bottom (B) and such that the indentation (V) in the second receiving area (A2) has an aperture angle. <EOS>