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Order the 27727 to have Campbell Scientific recalibrate a temperature and RH probe (HMP35C, HMP45C, HC2S3, HC2A-S3, or EE181). The accuracy of the recalibration is ± 2% from 10 to 90% RH and ± 3% from 90 to 100% RH. Campbell Scientific supplies before and after calibration sheets.

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