Folding Quadrat, Steel Frame, Consists of 4 white coated steel rods 0.5 m long with markers at 0.25 m, For population counts and other measurements in the field
Large Needle Electroscope, 1.5lbs, 7.0x6.0x4.0 in, ideal for classroom demonstrations of electrostatic principles, A light-weight metal vane, used as a pointer in the electroscope. A transparent scale, provided to measure the angle of the deflection
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