A suction fluid collector includes a transparent reservoir made of a resilient material with an upper opening positioned on one side of a flexible suction bag with at least one transparent side. A plate part made of a resilient material is positioned on another side of the suction bag opposite said reservoir. An urging means arranged between the reservoir and the plate part provides a force tending to expand a gap between the reservoir and the plate part. A suction tube is positioned partially inside the reservoir and extends through the suction bag.