A trial court must decide under a test of reasonable probability whether the identification and nature of the contents of an item is sufficient to warrant the item's reception in evidence. State v. Brown, 163 Conn. 52, 57, 301 A.2d 547 (1972). "Our standard of review regarding challenges to a trial court's evidentiary rulings is that these rulings will be overturned on appeal only where there is an abuse of discretion and a showing by the defendant of substantial prejudice or injustice. State v. Cole, 50 Conn. App. 312, 330-31, 718 A.2d 457, cert. granted on other grounds, 247 Conn. 937, 722 A.2d 1217 (1998). It is a well established principle of law that the trial court may exercise its discretion with regard to evidentiary rulings, and the trial court's rulings will not be disturbed on appellate review absent abuse of that discretion. . . . Sound discretion, by definition, means a discretion that is not exercised arbitrarily or wilfully, but with regard to what is right and equitable under the circumstances and the law . . . . and it requires a knowledge and understanding of the material circumstances surrounding the matter . . . . In our review of these discretionary determinations, we make every reasonable presumption in favor of upholding the trial court's ruling.' . . . Wright v. Hutt, 50 Conn. App. 439, 445, 718 A.2d 969, cert. denied, 247 Conn. 939, 723 A.2d 320 (1998)." State v. Orhan, 52 Conn. App. 231, 237-38, 726 A.2d 629 (1999).