Model WPL Resistance range  1 kohm to 10 kohm mech. Travel 11 mm to 51 mm  Linearity +/- 1 % mech. Live 5'000'000 Cycles           Model WPL - OS Resistance range  5 kohm per 100 mm mech. Travel 30 mm to 400 mm  Linearity to +/- 0.5 % mech. Life 10'000'000 Cycles