Golden Ratio Caliper

Don't know your blood type? Find out in minutes with this sterile blood type testing kit. Includes everything you need to take the test at home. Nothing needs to be sent to a lab. Tests for A+/-, B+/-, AB+/-, and O+/-...

Corning Pyrex® Glass Beakers are designed with uniform wall thickness. Borosilicate 3.3 glass provides the proper balance between mechanical strength and thermal shock resistance. The highest quality control in the industry means you'll get the most precise measurements possible.

PYREX Erlenmeyer flasks are designed with heavy duty rims to reduce chipping. Their uniform wall thickness provides the proper balance between mechanical strength and thermal shock resistance. Approximate graduations are in durable white enamel. An extra large marking space is...

This loupe provides an impressive 30x magnification, perfect for examining microprint details on dollar bills, inspecting jewels, or reading the fine print of your cell phone contract. A must-have for any geologist in the field.  

Volumetric flasks available in 4 sizes. Manufactured to Class A tolerances as established by ASTM E-694, ASTM E-542, and ASTM E-288. High quality inert 3.3 borosilicate glass. Flat bottom volumetric flask has a No. 27 standard taper ground stopper made...