Used Fluke 732A DC Voltage Calibration

Specifications :

10 V, 1.0 V, and 1.018 V outputs
0.5 ppm stability per month (10 V output)
Short circuit proof
12 hour battery life for calibration transfer
Output adjustment: 50 MicroV for 10 V and 1.018 V ranges, 5 MicroV for 1.0 V range
Output impedance: 1 M? for 10 V output, 1 k? for 1.0 V and 1.018 V outputs
Output current: ?12 mA at 10 V output, limited by 1 k? output impedance at 1.0 V and 1.018 V outputs
100, 120, 220, or 240 Vac 10%; 50-400 Hz; 24 to 40 Vac 50-60 Hz or 24 V internal battery - 12 hour operation
Weight: 27 lb; Size: 191 mm (7.53 in)Height x 221 mm (8.69 in)Width x 603 mm (23.75 in)Depth