Test-element for a mobile water analysis arrangement

A test element for a mobile water analyzing system comprising a photometer, the test element comprising:

• a test element body comprising a test element body length, a test element body width, and a test element body thickness, the test element body length being greater than the test element body width, and the test element body width being greater than the test element body thickness;
• a microfluidic sample line comprising:
• an inlet opening disposed at a first end, the inlet opening being configured to receive a water sample,
• a pump port disposed at a second end of the sample line,
• an inlet section disposed between the inlet opening and the pump port, and
• a measuring section formed by a longitudinal section of the microfluidic sample line, the measuring section comprising at least one window arranged at an end of the measuring section within the test element body thickness, the measuring section being arranged between the inlet section and the pump port and being coincident with a sample pathway;
• and
• a key reagent disposed in the microfluidic sample line,
• wherein,
• during a photometric measurement with a measurement beam, the measurement beam is aligned with the measuring section so that the photometric measurement occurs along the measuring section and not in a cross direction thereto, and
• the measuring section is formed by a longitudinal section of the sample line which is arranged perpendicular to the test element body length and parallel to the test element body width.