The only possible answer, with the information at hand, is: It depends. It depends on many, many things. Too many to list, really. What tools? How old? What brands? How old? What condition? What is the demand where you are? How will they be sold?
If there is going to be an estate sale, run by an estate sale specialist, just leave all that to them. If it's a professional machine shop full of machine tools, then get an auctioneer out there. If it's an average DIY shop, with tools over 20 years old, their value is anyone's guess. Have a "Man Sale," and advertise it on Craig's List and Facebook Marketplace, with several photos. Put prices on the individual items, based on whatever basis you have. Then take any reasonable offer that is made. You get one day to sell the stuff, then it's still there if it doesn't sell.
Or take photos of everything, in groups and advertise on Craig's List and Facebook Marketplace. Ask for the best offer for the entire lot. Set up an inspection time window. One day or two, with a two hour window to look at the tools. Get written offers. Give it a week, then sell it to the best offer. They haul away within 48 hours.
It's a lot of work. Is that something you want to handle? Very often, estates are most interested in closing it all up and dealing with it.
Many years ago, I was good friends with a guy who was a mineral collector. I visited him numerous times and even sold some of his stuff for him on my website. He died. His relatives, who had no interest whatsoever in his very large collection. Most of it was low end specimens, with a few good pieces sprinkled in here and there. His son, the executor, got in touch with me. He said that his Dad had told him to contact me about his collection. The son asked if I would be interested in buying everything. He said, "We have to clear this all out, so we can put his house on the market. I was interested, but didn't have a ton of money, and there was a whole bunch of stuff in boxes that was mostly rockhound stuff. There were also cabinets and drawers, etc. Whoever bought it would get a lot of stuff, and have a lot of work.
So, I did some calculations in my head. I told him that the most I could offer was $2500, and explained the issues, which involved time to get all that stuff, including the storage furniture, etc. His son said, "That much?" So the deal was done. I spent the next two days with a rented uHaul truck moving everything out and into a storage unit I had rented to hold it all. I hired a kid to help me move it, and paid him twice the going rate because it was hard work in very short time frame.
Anyhow, over the next year, I sold most of the good and moderately good specimens on my website. I sold the rough rockhound stuff to one guy for not so much, since he'd have to haul the two or three tons of it. The storage and display furniture went into my office suite and got used to help manage the stock for my online mineral specimen business. In the end, I probably had $12,000 in gross sales from that collection. It was a decent investment of the $2500. The heirs got the stuff cleared out and got some money, which was all they wanted. That's how estate clearances work.
See, it all depends.
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