A sampling set for extraction of a fluid sample from a fluid storage reservoir for optical analysis of the fluid sample, the sampling set comprising: a container of fluids comprising a movable protective casing and a translucent container enclosed within the protective casing, the protective casing being displaceable between a closed position in which the translucent container is protected by the protective casing and an open position in which at least a portion of the translucent container is exposed to the region outside of the protective casing; a frame having a gripping member for attaching to the translucent container; a clamping element (306,308) movable relative to the frame and disposed adjacent the gripping member in a position such that the clamping element is operable to displace the protective casing from the closed position to the open position, said clamping element being movable between a fluid container accepting position in which the fluid container may be inserted into the gripping member, and an analysis position in which the protective casing is in the open position, whereby the clamping element (306, 308) comprises first and second clamping members (402, 404) disposed on opposite sides of the casing; optical fibers (310, 314) defining an optical waveguide path being substantially aligned with the translucent container when the clamping element is disposed in the analysis position, to thereby provide optical access to the translucent container for optical analysis of the fluid sample therein, the optical waveguide path being further defined by at least one first optical waveguide slot extending through the first clamping member and at least one second optical waveguide slot extending through the second clamping member, whereby the optical waveguide slots are substantially aligned with the translucent container when the first and second clamping members are disposed in the analysis position; a source of light optically connected to the optical waveguide path; and a light detector optically connected to the optical waveguide path. a container of fluids comprising a movable protective casing and a translucent container enclosed within the protective casing, the protective casing being displaceable between a closed position in which the translucent container is protected by the protective casing and an open position in which at least a portion of the translucent container is exposed to the region outside of the protective casing; a frame having a gripping member for attaching to the translucent container; a clamping element (306,308) movable relative to the frame and disposed adjacent the gripping member in a position such that the clamping element is operable to displace the protective casing from the closed position to the open position, said clamping element being movable between a fluid container accepting position in which the fluid container may be inserted into the gripping member, and an analysis position in which the protective casing is in the open position, whereby the clamping element (306, 308) comprises first and second clamping members (402, 404) disposed on opposite sides of the casing; optical fibers (310, 314) defining an optical waveguide path being substantially aligned with the translucent container when the clamping element is disposed in the analysis position, to thereby provide optical access to the translucent container for optical analysis of the fluid sample therein, the optical waveguide path being further defined by at least one first optical waveguide slot extending through the first clamping member and at least one second optical waveguide slot extending through the second clamping member, whereby the optical waveguide slots are substantially aligned with the translucent container when the first and second clamping members are disposed in the analysis position; a source of light optically connected to the optical waveguide path; and a light detector optically connected to the optical waveguide path.