These sealable graduated glass bottles are ideal for samples that need to be monitored or measured as they are used. Each is made of clear, undistorted, USP Type III soda-lime glass and graduated in both milliliters and ounces. Wide-mouth design reduces the risk of spillage during transfer, while thermoset screw-on caps ensure samples remain unaffected by airborne contaminants like gas, oil, or chemical fumes. Special, 32-oz beaker utilizes convenient, French square design, allowing a more economical use of shelf space while making the container easier to grip when pouring.