AEI-ST/DT Calibrator Tester       The AEI-ST/DT Calibrator Tester is for both the Single and Dual Threshold monitors.   Size (h.w.d): 1"x 2.4" x 2.3" Mounting Velcro (supplied)/optional bracket Operator High = 10 Meg Ohms   Operator = 1 Meg Ohm in series with 100 pf   Low = 511K Mat Bench = 10 Meg Ohms Installation AEI-ST/DT Calibrator Installation and Test (PDF) More Info AEI Monitor Testing information.