1106 IM Audio Impedance Tester Model 1106 IM Audion Impdance tester features: Large LCD display68 x 34mm(1.338" x 2.677"). True measurement of speaker systems actual impedance at 1kHz. Three test ranges allowing testing of e theater and commercial sound systems. Measures transformer impedances. Battery operation. Low battery indication. Data hold function. EN 61010-1 CAT. 200V