Scientific apparatuses and instruments, namely, optical measuring, optical control and optical analysis apparatuses and instruments for scientific purposes, namely, for measurement of transmission of light and measurement of color and turbidity; Scientific apparatuses and instruments, namely, optical measuring, optical control and optical analysis apparatuses and instruments for scientific purposes, namely, for measurement of absorbance of light and measurement of color and turbidity; colorim...

CHEMICAL PRODUCTS FOR USE IN SCIENCE, VIZ., REAGENTS