The only that user needs to do to measure concentration of hemoglobin is to place a cuvette with prepared solution of blood in the photometric cell of the divice. Measuring value of hemoglobin concentration will appear on LCD instantly. There is no need neither to turn the device "on", nor to "warm up", nor to calibrate it before measuring. At placing the cuvette in the photometric cell, MiniHEM automatially turns on, performs measuring and indicates measured hemoglobin concentration on LCD. On pulling the cuvette from the photometric cell, MiniHEM switches to power-save mode and waits for a next measurement.