These robust hunidity chambers offer a more user friendly approach to immunohistochemistry staining. This tray is suitable for routine staining requiring a humidity chamber. Wells between rails holds water securely without splashing. The plastic rails are covered with a polymer strip for perfectly holding slides even if tray is held at an angle. Rails are raised not only to avoid water touching the slides but to make them more easily retrievable. The base will also excess stain solution dripping from the slides.