0.04% Aqueous Bromothymol Blue Indicator Standard_ASTM and is 4" in diameter

and is 4" in diameter at its widest point

transmitting light end-to-end via total internal reflection to give a tabletop analogue of a fiber-optic cable

and a spout for easy pouring

this sulfuric acid solution provides a ready strong acid for titration

Twelve polished stainless steel dual-end Chattaway spatulas at 4 inches each combine flat and bent ends for micro-sample scooping and scraping

0.04% Aqueous Bromothymol Blue Indicator Standard_ASTM and is 4" in diameterAqueous bromothymol blue pH indicator that shifts from yellow to blue across pH 6. 0 to 7. 6, widely used in photosynthesis, respiration, and acid base demonstrations.