Ballantine Laboratories, Inc. 
AC Voltage Standards and Meters
Wide-band Millivolt Meter: 1% Accuracy;
10 Hz to 10 MHz
AC-DC Thermal Transfer Standards: 10 ppm at audio frequency;
0.1% up to 10 MHz
AC-DC Auto-Transfer Standards: 10 ppm at audio frequency;
0.2 to 1000 V AC
Transconductance Amplifier: Input 0 to 1 V DC;
Output 0 to 100 A;
10 Hz to 100 kHz,
Oscilloscope Calibrator 6127B: DC to 500 MHZ DC to 1 GHz
Programmable with IEEE-488;
Dynamic Signal Analyzers: Channel: 1 to 4 ;
100kHz Spectrum Analyzer;
10.4" Color Display,