Profile: Leja Products B.V. is a manufacturer of disposable counting chamber. We offer Leja® slide for semen analysis and are also used for human semen analysis-standard analysis, human semen analysis-post-vasectomy analysis, porcine semen analysis, rat semen-toxicology research and other semen analysis. There are slides with 2 or 4 chambers and with chamber depths of 10 or 20 micron. The Leja slides have a standard low level of quantification which implies that even low sperm counts can be determined. It delivers Segre-Silberberg effect, a physical phenomenon that occurs when particles in a solution are transported by capillary forces, like sperm cells in a counting chamber. This effect causes the sperm cells to move faster than the filling front, hence causing an underestimation of the semen concentration. Leja's chambers which carry several design protections compensate this effect.