Specifications:

280A
 Input Voltage  90 - 250 VAC, 50/60 Hz, 12 W 
 Battery Operation   Up to 6 hrs with 12 V internal rechargeable battery
 Plate Capacitance  20 pF, ± 5% ( not including strays)
 Charging Voltage  ± 10 to ± 1000 V differential,
 adjust 10 - 100 V in 1 V increments
 Zero Stability  < 100 mV/sec
 Timer  0.1 - 999.9s in 0.1 s increments;
 1000 - 9999 s in 1 s increments
 Graphical Display  240 X 64 pixel, backlight LCD
 Voltage Display  3.5 digits; ± 1.0 V resolution
 Timer Display  4 digits
 Accuracy  Electrometer ± 0.1% reading,
 ± 1.0 V referred to input
 Interface  RS-232
 Operating Env.  5 - 35°C
 Dimensions  27.9W x 22.9L x 12.7H cm
 Weight  5.7 kg
 Certifications