Heath Heathkit IO-4210 10MHz Multi-Trace Oscilloscope Heathkit Unit powers on and is in good cosmetic condition. Has some external scufffs etc. and does not have a probe. I did my best to test what I could but without a probe (and no actual idea what I am doing) testing was limited. Here's what I can say: Screen is bright and whenever I turn a dial or flip a switch something on the screen changes. It does sweep left to right and basically looks like what I'd imagine (or seen on TV) what an in oscilliscope is supposed to look like. Thanks so much for stopping by! Let us know if you have any questions or need any additional images. Please take a look at our other vintage treasures and cool finds in the store! If you find a number of things you are interested in, please let us know and we will gladly combine shipping where we can*! *cannot combine shipping through the Global Shipping Program or with certain unique or fragile items Please note that we always try to reuse and recycle packing materials whenever possible Please message us first before leaving us neutral or negative feedback. Our aim is 100% customer satisfaction we can always create a positive resolution for any dissatisfied customer, Thank you kindly.