Compact light instrument, is intended for the measurement and the writing into the memory of the values of pulses beside different time intervals with the aid of the coupling cable. Instrument is ideal for the rapid calculation and the writing into the memory of pulses from the precipitation gauges of flow meters and to subsequent data processing on PK. The presence of the filter (suppression) of interferences prevents the errors of calculation. Large volume of internal storage, to 32000 elements of data. Possibility of connection based on PK on the means USB or RS-232 (option) and graphing regarding the obtained values.