Examples include the written contract, the defective part or defective product, the murder weapon, the gloves used by an alleged murderer.
Trace evidence, such as fingerprints, glove prints and firearm residue, is also a type of real evidence. Real evidence is usually reported upon by an expert witness with appropriate qualifications to give an opinion. This normally means a forensic scientist or one qualified in forensic engineering.
In a murder trial for example (or a civil trial for assault), the physical evidence might include biological evidence such as DNA left by the attacker on the victim's body, the body itself, the weapon used, pieces of carpet spattered with blood, or casts of footprints or tire prints found at the scene of the crime.