What kills a surplus lot before you even bid
Most surplus lots that look like bargains are traps. Here are the failure modes we have learned to spot from the listing photos alone.
Almost every lot that looks like a bargain is not one. The skill in this business is mostly negative: knowing what to walk away from, fast, so the time goes to the few lots that are real.
Here is what we have learned to look for, most of it visible in the listing before you ever put a hand on the equipment.
Batteries left in the device
This is the one that catches people who are otherwise careful.
Alkaline batteries left in a device in storage leak. Not sometimes. Given a few years in an unheated warehouse, reliably. The electrolyte creeps out, wicks along the contacts, and eats the traces on the board underneath. By the time you see the white crust, the damage is done and the repair is usually not economic.
Government surplus is stored for years by definition. So any device with batteries installed at the time of disposal is a parts unit until proven otherwise, and we bid it that way or not at all.
If you can see the battery door in a photo, look at it hard.
Software you cannot get
The quiet killer, especially in lab and industrial equipment.
Plenty of expensive hardware is inert without the manufacturer’s control software, and that software is frequently node locked, non transferable, or simply not sold to secondhand owners. The institution that disposed of the equipment kept the licenses, almost always without realizing they were the valuable part.
Before bidding on anything that needs software to function, work out the license path. If there is not one, the hardware is worth its scrap value regardless of its condition. We wrote about how this plays out on a real instrument in the software gate.
Missing the part you cannot buy
Every complex instrument has one component that is disproportionately hard to replace. On an AFM it is the vibration isolation. On a compound microscope it is the objectives, which can be worth more than the microscope. On a lot of industrial equipment it is a proprietary controller board that has not been manufactured in a decade.
Learn what that part is for the category you are buying, and confirm it is in the photograph. Its absence turns a good lot into scrap, and its presence is frequently invisible to everyone else bidding.
Fungus, on anything optical
If you are buying microscopes, cameras, or anything with lenses, fungus in the optics is death. It etches the coatings, it spreads, and there is no cheap fix. A microscope with clean glass and a scuffed body is worth many times one that looks pristine and has a haze in the objectives.
Ask for a photograph through the eyepiece. Most sellers will take one. The ones who will not have told you something.
The lot that only works if everything works
This is a mindset error rather than a physical one, and it is the most expensive.
Every surplus lot is sold untested, as is, with no recourse. So the only safe way to price one is to assume the worst plausible condition and ask whether the numbers still hold. If a lot is only profitable when every unit powers on, it is not an investment, it is a bet, and the house is a county warehouse that owes you nothing.
We assume it is broken. If the price still works on that basis, we bid. Anything that does work is upside.
The thing that is worth a fortune to four people
A real trap for anyone who has just learned to read comps.
An instrument can be genuinely worth forty thousand dollars and still be a terrible buy, because the total number of buyers on earth is very small and none of them are shopping this quarter. Thin markets are not a reason to avoid a category, but they demand two things: patience, and a channel where the actual buyers are looking.
If you do not have both, the correct move is to pass, no matter how good the arithmetic looks.
The summary
Assume it is broken. Find the part that cannot be replaced. Check the batteries. Check the software. Ask who is going to buy it and where, before you ask what it is worth.
Most of what makes money in this business is the lots you did not buy.