Le Métas­cope was one of the last tray-based designs that was intro­duced in France, and dif­fer­ent mod­els were avail­able. The frost­ed glass at the back of the device is used to illu­mi­nate the glass slides and can be removed to attach an option­al pro­jec­tion lantern or elec­tric illu­mi­na­tor. In this case, a larg­er frost­ed glass is mount­ed inside the device to replace the removed glass plate.
The stan­dard mod­el sup­port­ed inter­change­able trays for 45 x 107 and 6 x 13 / 7 x 13 slides, so mul­ti­ple stere­oview for­mats could be viewed with a sin­gle device. It was there­fore called Métas­cope Universel.
A small­er mod­el for 
45 x 107 slides only was named Métas­cope Spéciale.
Both mod­els were also avail­able “à foy­er court”, i.e. with short focus lens­es for bet­ter mag­ni­fi­ca­tion of the slides.
Dif­fer­ent stor­age com­part­ments were avail­able, rang­ing from small pedestal to a piece of fur­ni­ture. The so called Méta­m­a­gasin was offered in lat­er cat­a­logues and had a three draw­er stor­age com­part­ment per­ma­nent­ly attached.