This product will allow you the accuracy to sex your geckos with sufficient lighting. If you look carefully, the first sign that your gecko is male or female, in many species, can be found by a ‘V shape’ of pores located above the vent (cloaca) of the gecko. This can be discovered often long before the development of a hemepenile buldge in males. This is quite often the earliest way to detect the sex of many types of geckos. This is a must have item for those interested in determining sex as soon as possible.