First of all, it is usually only possible to determine the sex of adult scorpions.
Juveniles generally look the same for both sexes.
Subadults of both sexes usually look like females. Adult males and females can vary in a number of characters. Sometimes the most obvious is the general difference in body shape and size. Males tend to be smaller and thinner, with relatively longer metasoma and pedipalps than females of the same species. Often there is some allometric growth in the pedipalps of the males so that they are larger, longer, or thicker than those of the female.