Humidity Calibration Standard Relative Humidity Accuracy +/-1 Percent at 77 Degrees F Number of Pieces 1 Compatible Probe Diameter Up to 0.6 in Compatible Manufacturer Model Number 8706 R6001 R6200 R9900 SD-3007 Product Type Humidity Meter Calibration Standard Sample Humidity 33 Percent Function Verification and Calibration of Humidity Probes