Described herein is a receptacle for holding a sample under spectrophotometer analysis comprising: a body, first and second opposing windows separated by a gap to provide a volume for a sample, wherein at least the first opposing window is supported by a first compliant member, and wherein under a force, the first compliant member allows positioning of the first opposing window relative to a first datum to set a desired: a) gap between the first and second opposing windows, and/or b) relative orientation of the first and second opposing windows.
