+ SR_UNIT_VOLT = 10000, /**< Volt */
+ SR_UNIT_AMPERE, /**< Ampere (current). */
+ SR_UNIT_OHM, /**< Ohm (resistance). */
+ SR_UNIT_FARAD, /**< Farad (capacity). */
+ SR_UNIT_KELVIN, /**< Kelvin (temperature). */
+ SR_UNIT_CELSIUS, /**< Degrees Celsius (temperature). */
+ SR_UNIT_FAHRENHEIT, /**< Degrees Fahrenheit (temperature). */
+ SR_UNIT_HERTZ, /**< Hertz (frequency, 1/s, [Hz]). */
+ SR_UNIT_PERCENTAGE, /**< Percent value. */
+ SR_UNIT_BOOLEAN, /**< Boolean value. */
+ SR_UNIT_SECOND, /**< Time in seconds. */
+ SR_UNIT_SIEMENS, /**< Unit of conductance, the inverse of resistance. */
+ /**
+ * An absolute measurement of power, in decibels, referenced to
+ * 1 milliwatt (dBu).
+ */
+ SR_UNIT_DECIBEL_MW,
+ /** Voltage in decibel, referenced to 1 volt (dBV). */
+ SR_UNIT_DECIBEL_VOLT,
+ /**
+ * Measurements that intrinsically do not have units attached, such
+ * as ratios, gains, etc. Specifically, a transistor's gain (hFE) is
+ * a unitless quantity, for example.
+ */
+ SR_UNIT_UNITLESS,
+ /** Sound pressure level relative so 20 micropascals. */
+ SR_UNIT_DECIBEL_SPL,
+ /**
+ * Normalized (0 to 1) concentration of a substance or compound with 0
+ * representing a concentration of 0%, and 1 being 100%. This is
+ * represented as the fraction of number of particles of the substance.
+ */
+ SR_UNIT_CONCENTRATION,
+ SR_UNIT_REVOLUTIONS_PER_MINUTE, /**< Revolutions per minute. */
+ SR_UNIT_VOLT_AMPERE, /**< Apparent power [VA]. */
+ SR_UNIT_WATT, /**< Real power [W]. */
+ SR_UNIT_WATT_HOUR, /**< Consumption [Wh]. */