“…By and large, what was said about manual probes also holds true for electronic probes. In fact, a great many studies were undertaken to determine the method error of second-and third-generation probes (Hassell et al, 1973;van der Velden, 1978;van der Velden and de Vries, 1980;Watts, 1987Watts, , 1989McCulloch et al, 1987;Gibbs et al, 1988;Goodson and Kondon, 1988;Magnusson et al, 1988a,b;Osborn et al, 1990Osborn et al, , 1992Becherer et al, 1993;Tupta-Veselicky et al, 1994;Wang et al, 1995;Mayfield et al, 1996). Single measurement errors between ± 0.2 mm and ± 1.0 mm were reported.…”