±ZERO Electret

±ZERO Electret

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$45.00
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$45.00
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The ± ZERO Electret is designed to "zero" your SPER-1 or 1E (Surface Potential Electret Reader). The stainless steel disc in the centre of the electret has no surface potential; when used to check your reader, the voltage displayed should be within ± 3 volts of 0.

The ± ZERO Electret is an integral part of your E-PERM QA/QC program and helps ensure the accuracy of your radon measurements.