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The sphere powered by the sun
30 pieces include lenses
A challenge worthy of Aristotle
vertical display
and then the ball at the other end is propelled outward
ph Buffer Solution Ornamental Instrument The sphere powered by theYou'll need refills of these to perform repeat or multiple ph measures using the meter sold separately. Handy temperature conversion chart on label (pH varies with temperature). Pottle is 6. 5 cm high by 3 wide. Buffer solution and meters enable measurements to within 0. 02.
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