Racotech Geophysical Instruments.
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Equivalent to GS-30CT;
Distortion: <0.1%
Tolerance: <2%

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Equivalent to GS-32CT; Distortion: <0.1%; Tolerance: <2.5%;

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Distortion: <0.1%; Tolerance: <2.5%;

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Distortion: <0.2%; Tolerance: <5%;

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Distortion: <0.2%; Tolerance: <5%;

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Equivalent to JF-30DX; Distortion: <0.1%; Tolerance: <2.5%;
