The ESI 801A Generator-Detector features double-chassis constructions, or guarding, to greatly reduce stray leakage paths to ground. Leakage from the high generator terminal and from the high detector terminals to ground has been virtually eliminated. Specifications: Generator: 6 ranges, continuously variable, 0 to 600 V; Power limited to 1 W; 1 to 100 kohms; Detector: calibrated ±3 µV to ±1000 VDC end scale in 18 zerocenter ranges, sensitivity (uncalibrated) can be increased to about 0.75 µV end scale; ±5% accuracy of end scale, ±0.1 µV; ±15 µV limits of zero control.