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and principles for refraction and focal distance experiments
These lenses are included in the Tech Light Lab kit
The beautiful purple beam is less visible than red or green because our eyes are less sensitive to the Ultra Violet (UV) range
click-off switch to keep your hands free to adjust the diameter of the beam
Keep it in your wallet at all times so you're always ready to do some science
The Pocket Scientist High School Ed. - STEM Ruler 6-12+ and principles for refraction andMaster 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