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Two-point humidity calibration kit pairing the 33% (R9933) and 75% (R9975) standards in one package, for verifying humidity meters across their workin..

The SD-230-Kit2 bundles REED's SD-230 data-logging meter with a PE-11 pH electrode and an ORP-14 ORP electrode. It measures pH from 0.00-14.00 and ORP..

This Automatic Temperature Compensation (ATC) probe connects to the SD-230 pH/ORP Datalogger for increased accuracy.