Comparison : Item # HF4141, HF Series 200 Millivolt (mV) Output Linearity (?) and 400 Millivolt (mV) Dual Output Interlinearity (X/Y) (?) Proportional Multi-Axis Fingertip Controller
Item # HF4142, HF Series 200 Millivolt (mV) Output Linearity (?) and 400 Millivolt (mV) Dual Output Interlinearity (X/Y) (?) Proportional Multi-Axis Fingertip Controller
Item # HF50W18, HF Series 200 Millivolt (mV) Output Linearity (?) and 400 Millivolt (mV) Dual Output Interlinearity (X/Y) (?) Proportional Multi-Axis Fingertip Controller