FemtoJet express microinjector injects liquids into early developmental stage embryos, such as Drosophila melanogaster, Xenopus laevis, Caenorhabditis elegans, zebrafish and others. The unit is comfortable to operate. A PC interface provides for semi-automated microinjections. External pressure supply and adjustable compensation pressure prevent backflow of liquids into the injection solution. Pressure range and parameters ensure productivity and precision.