Steel Extension Spring, 6 x 0.25" Category_Science Gifts Adjustable-vibrator induction coil producing a

Adjustable-vibrator induction coil producing a 30mm spark from a 6-12V DC input

Hand-painted skin cross-section enlarged 300 times exposes epidermal layers

001 inch with a friction roller and a lock mechanism for held readings

closing a circuit by inserting the plug into the gap between the copper blocks

Fitted with a grey hand knob for tightening and a small plastic pulley

Steel Extension Spring, 6 x 0.25" Category_Science Gifts Adjustable-vibrator induction coil producing aSix inch steel extension spring with looped ends at 0. 25 inch diameter, the mid length option for paired Hooke's Law comparisons against 4 inch and 9 inch siblings in the series.