You can easily measure the impedance of the speaker line like the resistance measurement of the tester (circuit test instrument). ● Power supply: AA / 3 -type dry battery R6 × 4 (DC1.5 V × 4) ● Current consumption: 39 MA ● Measurement value instructions: meter direct instruction unit: ω (ohm) × 10 range 50 Ω ~ 10 kΩ × 100 range 500 Ω ω ω Ω ~ 100 kΩ ● Measurement accuracy: ± 10 % ● oscillation frequency: 1 kHz ± 10 % ● Continuous use time: × 1 range 30 hours × 10, × 100 range 60 hours continuously ● Used temperature range: -5 ° C ~ + 40 ° C ● Dimensions: 120 (W) x 220 (H) x 63 (D) mm (storage case) 110 (w) x 180 (H) x 58 (d) ) MM (main body only) ● Finish: ABS resin black (Mansel N1.0 approximation color) ● Mass 700 g (including storage case, battery -free) ● Accessories tester lead…