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the grid size is about 30x30mm
Premium Quality: Compound Pendulum t is made of high-grade construction all the way through
Slide switches that allow the user to simply add or subtract for desired value
Perfect for math students
Electric Transparent Bell w/ Battery holder Locust Model the grid size is aboutElectric Transparent Bell w Battery holder. The electrical bell Dia 5. 5cm. Working under DC3V. With wooden stand 9x9cm. Premium Quality: Electric Transparent Bell is made of high grade construction all the way through, excellent build quality and proven reliability across the range. Designed for use in professional laboratories but is an ideal choice for science classrooms and household use. If you need custom order with different sizes design,
