I am performing an experiment that requires both positive and negative voltages to be measured. When using your ULI with a Voltage Probe, it only reads 0 to 5 volts. What can I do to measure both positive and negative voltages?July 6, 20040 The problem is that the ULI, or SBI, can only read positive voltages. Listed below are several options to read both positive and negative voltages:...... Continue Reading →