+ 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. */