100mm Spark Induction Coil with Adjustable Vibrator Science at Home_Elementary Science Double-concave glass lens at 3-inch

Double-concave glass lens at 3-inch diameter and 200mm diverging focal length

this pack of premium qualitative filter paper offers medium-speed gravity filtration with a 10-micron pore size at 85 gsm weight

spanning cell voltages up through high-tension supply outputs

sized so that students can charge an outer pail and watch the inner pails register zero charge during the classic ice-pail demonstration

100mm Spark Induction Coil with Adjustable Vibrator Science at Home_Elementary Science Double-concave glass lens at 3-inchLarger spark 100mm induction coil from a 6 12V DC input with adjustable vibrator and base mounted suppression capacitors, supplied with two 5 inch insulated handle pointer electrodes.