(under the class definition) Subject matter which includes optical test apparatus to perform simultaneously or sequentially at least two different optical tests which are both a part of the basic subject matter of this class.
(1) Note. Two identical optical tests which are part of the subject matter of this class, performed simultaneously or sequentially will be classified here providing each test has its own indicator or manner of determining its test individually rather than both tests collectively operating a single indicator.
(2) Note. Included here is convertible subject matter which would permit an optical test device which is part of the basic subject matter to be changed into a optical test device which is also the basic subject matter of this class.
(3) Note. Light meters which by a change in the
galvanometer scale or by addition of a color filter to become a pyrometer or a colored light meter are not considered to be convertible for this subclass. See the section on pyrometers, spectroscopy, or shade or color for proper classification of this subject matter.
(4) Note. Visual inspection simultaneously or sequentially with a optical test of the class will be classified here.
