Keysight (Agilent/HP) 3325B

Frequency range from 1 µHz to 21 MHz with 11-digit resolution, Waveforms: sine, square, triangle, and ramp, Continuously adjustable DC and phase offset, Sweep capability and PLL connection to an external reference possible. All functions programmable via IEEE-488 interface. FUNCTION GENERATOR 1 µHz - 21 MHz