Buku la wogwiritsa ntchito la J TKF-12 ndi J TKF-13 Phase Sequence Tester limapereka malangizo atsatanetsatane ogwiritsira ntchito zoyesera zotsekeredwa pawirizi. Onetsetsani kuti voliyumu yoyeneratage range, insulation, ndi pafupipafupi kuti mupeze zotsatira zolondola. Oyenera kuyika magetsi a magawo atatu, zoyesa izi zimapereka chizindikiritso chozungulira ma mota komanso kuzindikira kocheperako. TKF-12 imakoka mphamvu kuchokera pa netiweki, pomwe TKF-13 imagwira ntchito pa batire ya 9V yokhala ndi mawonekedwe a AUTO-OFF. Kudalirika ndi akatswiri pazachitetezo chamagetsi komanso kutsata miyezo ya EN 61010-1.
