Ingrid Auer described in her book "Spiritual Essences. Interdimensional tools for a New Age" the use of pendulum tables to check the right Angel / Master Essence or Symbol.
Since 1997 Angel Symbols and Angel Essences have been used as tools from the spiritual world, more and more successfully. The reason why Gerd Schwank, partner of Ingrid Auer, started to interview numerous users, was to show the great variety of possible fields of application. The book should provide evidence of the effectiveness of these angelic tools both for laymen and energy-practitioners. Furthermore it wants to encourage those who are open for new and unconventional paths.