Tektronix 7A29 is a wide-bandwidth Amplifier Plug-In Unit designed primarily for use in vertical compartments of the 7000-Series Oscilloscopes. It offers seven calibrated deflection factors, a VARIABLE deflection factor, and polarity INVERT selections. The 7A29 features selectable DC or AC coupling and automatic overload disconnect, protecting the input from damage. With the optional 4, it also provides a Variable Signal Delay of +0.5 ns. Overall, the 7A29 is a versatile and reliable tool for various measurement applications in oscilloscopes.