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The SPECTRA X has a feature that other SPECTRAs in the product family do not; removable optical excitation filters.
There are fixed in the SPECTRA and SPECTRA S. The filters are installed in individual holders which the user can access
once the top cover retained by two thumb screws is removed. Refer to the photo below.
SPECTRA X with removable filter holders
SPECTRA, SPECTRA S and SPECTRA X Instruction Manual
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