In Miller v. Brass Rail Tavern, Inc., 541 Pa. 474, 480-481, 664 A.2d 525, 528 (1995), the Supreme Court stated that the standard for qualifications of an expert witness is a liberal one. The test to be applied when qualifying an expert witness is whether the witness has any reasonable pretension to specialized knowledge on the subject under investigation. If he does, he may testify and the weight to be given to such testimony is for the trier of fact to determine. It is also well established that a witness may be qualified to render an expert opinion based on training and experience. Formal education on the subject matter of the testimony is not required .... It is not a necessary prerequisite that the expert be possessed of all of the knowledge in a given field, only that he possess more knowledge than is otherwise within the ordinary range of training, knowledge, intelligence or experience.