+/* Voltage and current ranges. Values are: Min, max, step. */
+static const double volts_30[] = { 0, 31, 0.01, };
+static const double volts_60[] = { 0, 61, 0.01, };
+static const double amps_3[] = { 0, 3.1, 0.001, };
+static const double amps_5[] = { 0, 5.1, 0.001, };
+