This listing is for one used Advantest R4131D spectrum analyzer.  Powers up, screen works, buttons and knobs are responsive.  Front is in excellent visual condition except that one corner of the plastic screen bezel has a small crack where one of the screws was overtightened.  Screen has some slight burn-in which makes the display a bit difficult to read.  Some scratching and scuffing on top and sides.  One of the plastic "feet" that protects the connections on the back has a small piece broken off as shown.  Last calibrated 2005.  No probe or other accessories included.  Free shipping.