I cant seem to find anything in english! here's this dodgy translation though!
Recognition of gender: The most reliable method is to check the lid intercourse. Males have them more oval, while the lid females are more triangular. More than males have a longer femur and kneecap pedipalpy. The number of teeth of pectin for both sexes is 12-18 units.
So,basically like a lot of scorpions,the genital operculum is the telltale,here though rather than saying the male has a split or indented operculum,they are saying it is oval and the females more triangular.
I dont think anyone can tell you without seeing the underside of the scorpion,although assuming this scorp is well fed and hydrated,it seems to have a long body that might indicate male