The 10 - 20 slide unit is the standard for manual staining procedures.

The removable glass slide rack has an open bottom to facilitate rapid immersion and drainage, reducing carryover. The rack holds 10 single slides, 19 slides arranged alternately straight across and diagonally, or 20 slides back-to-back. Standard slide sizes accommodated are 3×1" (75×25 mm), 3×1¹/₂" (75×38 mm), and 3×2" (75×51 mm). Manufactured from soda-lime glass. Approximate inside dimensions are 91L×71W×60D mm.