Prototype Spermcheck1 male fertility kit, 2001.
© Science Museum / Science & Society Picture Library
This test kit is designed to check whether or not a man is fertile. There are normally between 70 and 100 million sperm per millilitre of semen. This test is able to detect levels as low as 100,000 sperm per millilitre and sometimes even lower. The World Health Organisation considers this number infertile.