Keysight (Agilent/HP) 403B

The 403B AC Voltmeter is a transistorized, battery-operated average-responding AC voltmeter. The unit can also operate from an AC line. Batteries recharge during AC operation. Voltage range: 0.001 to 300 V in 12 ranges Frequency range of 5 Hz to 2 MHz Accuracy of ±2% from 10 Hz to 1 MHz and ±5% from 1 to 2 MHz Fuse-protected overload AC-VOLTMETER 5 Hz - 2 MHz