Tesoro's approach, with both the Cortez and de Leon, is amore limited scale bunching a lot of targets up in that high 95 range. The de Leon is even more limited.
Like any detector with Target ID the visual display readout is going to be governed by the Target size, shape, distance from the search coil, and especially it's conductivity properties.
There are a lot of targets that will register in the upper range of a Target ID detector. With most detectors your good copper pennies and other copper coins as well as clad coins and silver coins are all higher conductivity targets. Many detectors will have them spread out over a little bit more definable range.
The Tesoro de Leon will lump most of those higher conductors to register with a numeric 95 read out. Unfortunately, many unwanted targets, such as discarded soda cans and the like, can't reduce higher numeric readouts or visual Target ID readouts that on some models will read Penny, dime, quarter, half, Etc.
The best thing a user can do is learn how to use the pinpoint mode or all-metal mode to size and shape a Target. If they suspect the target might be a can or another large object, that can be indicated by raising the search coil above the ground while sweeping the coil left and right. If the coil is raised higher than what it's able to be raised for a single coin, that's the suggestion you have a big Target.
But that only indicates It's something larger than a single coin, but it does not really tell you if it's a good Target for a bad Target. Only that it's a larger size Target.
If you're new to the metal detecting Hobby, and the de Leon is your first detector or at least your first with visual Target ID, just read the manual several times and learn all you can using the detector a field to help Define smaller size from larger size targets