[Orinade--an aid for orientation when working with serology plates]

Simple and cheap aid for help during pipeting of the reagent on standard microtiter 96 well plates is described. By means of the 8 x 12 LED diode matrix under the plate is by running the program from the memory accomplished the guide during the plate. The number of current sample is indicated by means of numerical display. The use of described aid limited the number of false pipeting in routine work.