Ok I wanted to double check that my baby pastel, 1000g spider and 500g mojave were all female and had a few other snakes checked at the same time. All those were female, but she sexed what I was sure was a breeder female (I had traded a pancake tortoise for two hold back females around 1300g) as a male, which really put me off, and she probed a male mojave I had (that I bought from Ben Siegel at the Tampa expo and remember him or employee of his popping it for me showing it clearly to be a male) as a female.

I had called and asked and she offered to resex the snakes in question for free. I am also planning on getting a probe set of my own now that I've seen it done in person.

I like this set of probes from reptile basics.