Design based on "capacitor parallel" theorem. Tolerance +/-5% 100V metal film capacitors. 4mm banana sockets with plugs, easy to connect wires. High quality FR4 glass fiber PCB. Programmable Capacitance: 1nF to 9999nF, 1nF per step. This is "capacitance substitution box" good low-cost alternative solution, can flexible and quick setting capacitance range from 1nF to 9999nF, step accuracy 1nF. for educational experiments, electronic engineering design or test trimming are excellent applications. Features: Design based on “capacitor parallel” theorem. Tolerance +/-5% 100V metal film capacitors. 4mm banana sockets with plugs, easy to connect wires. High quality FR4 glass fiber PCB. Programmable Capacitance: 1nF to 9999nF, 1nF per step. Capacitance Tolerance: +/-5% Max. Working Voltage: 100DC / 70VAC. PCB Size: 89.6 x 64.2mm / 3.53" x 2.53"