Humidity Calibration Kit (33% and 75%)1% accuracy at 77F (25 C) Compatible with probes with a diameter up to 0. 6" (15mm) For use with REED R6001, SD 3007 and 8706 Includes: R9933 (Humidity Calibration Standard, 33%) and R9975 (Humidity Calibration Standard, 75%) Manufacturer Part Number: R9980
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