Store › GP-8p: SC/GSR Snap Lead (GP-12 only) Image 1 of 1 GP-8p: SC/GSR Snap Lead (GP-12 only) $50.00 Skin conductance/resistance snap lead compatible with SE-35 loops. For use with the GP-12e only. Quantity: Add To Cart Added! Skin conductance/resistance snap lead compatible with SE-35 loops. For use with the GP-12e only.