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adjustable focus and a click-on
and principles for refraction and focal distance experiments
The beautiful purple beam is less visible than red or green because our eyes are less sensitive to the Ultra Violet (UV) range
These lenses are included in the Tech Light Lab kit
The iconic periodic table poster by author Theodore Gray is now available as an 8
The Pocket Scientist High School Ed. - STEM Ruler 6-12+ adjustable focus and a click-onMaster science fundamentals to prepare for any career in STEM. STEM ESSENTIALS LASER ETCHED INTO A WALLET SIZED STAINLESS STEEL CARD: 14 helpful unit conversions, 26 essential equations, and 13 common physical constants to save time doing homework and reinforce critical concepts. Doubles as a wallet ruler, compass and protractor. Photo scale ruler to calibrate length in experimental images. Periodic table, pH scale of acids and bases, plus full