If it was me and I was going to purchase a system I would use Microsoft Office and get one of the many barcode reader suites that interface seamless to the MS Office suite... I would do it this way because MS Office is the defacto compatible file format so as time passes it will make potential upgrades easier vs trying to dump/convert a proprietary database... It also make deployment easy since most offices and companies already have the office suite up and running...
I have to ask how much equipment are we talking about and how often is it inventoried? Because pencil and paper is tried and true as is manual entry if the count is low and inventory is only done every so often...
You can also consider low cost mobile platforms like Android tablets, the camera on most devices is quite suited to barcode scanning...
Consider an Android App like
this for $2.49 cents and an Android phone or tablet and you are golden... {{Not a recommendation, just a Google hit}}