±ZERO Electret

Radon North Verified independent store

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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; wh en 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. Show more