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1.  Digital Display:  3 1/2 digits, Resolution: 1 gauss. 
2.  Measuring Range:  0∼20.0K gauss, autoranging.   Two ranges:  0∼2.0K, 2.0K∼20.0K gauss. 
3.  Accuracy (probe excluded):  Normal   : ±(0.1% Rdg.+ 0.05% FS) 
           Peak hold : ±(0.2% Rdg.+ 0.1% FS) 
           (1/4) x 4  : ±(0.3% Rdg.+ 0.1% FS) 
4.  Peak hold decay <-0.05% /sec. 
 
5.  Accuracy ( probe included ) : At 10K gauss : ±1.7% 
           0 ∼15K gauss : ±(2% Rdg.+ 0.1% FS) 
       15 ∼20K gauss : ±2.5% 
6.  Dim. : 14(L) x 22.5(H) x 23(D) cm. 
7.  Net Weight :  2.8 KGS. 
138A Gauss Meter is exclusively used to test the flux density of all kinds of magnetic components. Regardless what its material or the shape of magnet is, Model-138A can test its flux density. 
For example: Ferrite Magnets,Flexible Rubber Magnets ,Rare Earth Magnets,Alnico  Magnets…can all be tested by Model-138A. Also, Magnets for loudspeaker,headphone,microphone magnet,motor and relay, as well as other magnetism components can all use Model-138A to test its flux denstity.138A is especially designed with "Peak Hold" & "Auto Accumulating and Auto-Averaging" two functions, especially suitable to test the flux density of the magnetic gap of loudspeaker ,headphone and microphone…etc.  
2. Peak Hold 
To use a Gauss meter without the "Peak Hold" function" for  testing the flux density, due to the unsteady vibration of the Gauss Meter's needle or the unstable displayed value in course of testing , it is hard to obtain the real "Peak Value". Model-138A has the "Peak Hold' function which can test the "Peak Value" easily. If user used a Gauss meter without the "Peak Hold" function to test the flux density in magnetic field, then, he must observe the test value and adjust the testing position simultaneously in course of testing, so to obtain the biggest (ideal) value, in this case, user has to repeat numerous testing, consequently, sensor chip of the probe might got abrasive easily, moreover, it might got broken due to distraction of the user. 
3. Auto Accumulating and Auto-Averaging  
To test the flux density of the magnetic gap, user must sum up the peak value at the 4 points magnet gap, and divide the total peak values by 4, to get the average peak value. If used a conventional Gauss Meter, user must record down the 4 tested peak values, and compute the average peak value manually, this is inconvenient and time-consuming. 138A is a unique design with "4 times auto accumulating & averaging" functions, rapid test & accurate result.