This function generator is a widely used in universities and colleges and its a variety of excellent features specified as follows: Digital cymometer and counter function; Built-in linearity/log sweep function; All ports with short circuit and input voltage protection; Ext FM and VCF input; Metal casel , fine electromagnetic compatibility, smart outline; Output voltage LED display, TTL/COMOS output; Frequency variable to gain more accurate measurement; Touch switches lightly, panel function indication; 50Hz sine wave output, convenient to experiment teaching.