SODIAL(R) Black Speaker Polarity Tester PH Phase Meter/Phasemeter for Auto Car Product Name: PH Phase Meter; Dimensions: 10.5 x 7 x 2.5cm/ 4.1 x 2.8 x 1.0inches(L*W*H); Color: Black Material: Plastic,Metal Package Content: 1 x PH Phase Meter Powered By: 1 x 9V 6F22 Battery(not included)