US$ 17.95
mechanical-advantage
Single B22 bayonet lamp holder on a hard plastic base with two 4mm banana terminals
providing a quick swap-in reference for general-purpose AC-circuit and timing-experiment work
knock sensor
sized to power multiple bench instruments off a single wall outlet
Dual-Range Moving Coil DC Voltmeter, 0-5V / 0-15V Material_Mesh mechanical-advantageDual range 0 5V and 0 15V moving coil DC voltmeter at plus or minus 2. 5% accuracy with an inclined face, letting students read both small cell and battery stack voltages on a single instrument.