Product Parameters:

It shall not be affected by environmental noise, and the positive and negative comparison of any type of loudspeaker and earphone shall be determined immediately, which is suitable for use on the production line< br />
It can be connected to three different instruments (152A, 7117C, and 7116C). Only one person can operate it, saving labor and time< br />
Easy to learn and use, with good reliability< br />
Extension device socket with positive and negative comparative indicator light, (this socket needs to be plugged” Extended Pilot  Model-139BL”)< br />
Model-139B Basic Specifications
Pulse Testing Method.< br />
Polarity :

Pos. polarity :Green LED indicator with beep sound.< br />
Neg. polarity:Red LED indicator with no sound.< br />
Sensor:ECM

Five selecting switches :

WF:suitable for the woofer.< br />
M& T:suitable for the midrange, tweeter & headphone.< br />
Ext.1~Ext. 3 : For connecting instruments.< br />
Dim.: 28 ( L ) × 9 ( H )× 21 ( D ) cm.< br />
6.Net Weight : 2.5 KGS