This listing is for a tester for testing the sex gender of chicks (or humans too) or fertility of Hatching eggs if you want to purchase good quality fertile chicken or geese eggs than see my other products 
Sexing Indicator Magnet for Birds & Eggs. Condition is "New". Dispatched with Royal Mail 2nd  Class.

Bird sex indicator magnet.

Simply hover the magnet over the birds vent and wait until the magnet settles.

If the magnet starts moving in a circular motion it's a female/Hen

If the magnet starts moving backwards and forwards from head-to-tail it's a Male/Cock

Neodymium iron boron 'rare earth' material - strongest magnet material available - this is a one side magnet model with thin cotton line for improved efficiency.

Can be used on Fertile eggs or chicks of any age(or Humans)

🐥Saves having to check very intrusive vent checking

on chicks 🐣

We have sold this particular device for many years to bird breeders and receive many, many reports of complete satisfaction.

No scientific claim is made as no such studies have been carried out but seems to work every time

You tube video is available to view just copy and paste the link below

https://youtu.be/RrmDrDWzRzc

it works on humans too so if it dosent work on you try it on your partener,or friend, just hold it above ther head or hold it outside their private parts. ive only had one pertson it didnt work on, sadly it turned out he was having fertility treatment and was infertile. you can also try on supermarket eggs and youll find it wont work, as they are infertile