Reed R9933 33% Humidity Standard for R6001/sd-3007/8706/r6200/r9900/r9905/r6050sd

33% humidity calibration standard used to check and calibrate the accuracy of compatible REED humidity meters, including the R6001, SD-3007, 8706, R6200, R9900, R9905, and R6050SD. Rated to about +/-1...