Probe Adjustment Using the keypad, a digital HygroClip probe can be adjusted at one or more points with the HygroLab indicator 1. A better alternative is to connect the HygroLab 2 to a PC with the HW4 software and to adjust the probe from the PC. Using a PC makes it possible to generate, save and print a probe adjustment protocol. The HygroClip probes can be adjusted for temperature at up to 2 points and for humidity at up to 4 points. The physical reference is provided either by a humidity standard or by a humidity-temperature generator. 1 The HygroLab 1 is limited to a 1-point adjustment of the probe.   HW4 Software: software based probe calibration is both simple and precise: there are no hard-to-reach, hard-to-adjust potentiometers. HW4 offers a high level of flexibility in selecting the calibration reference, giving the user complete control over the calibration process. HW4 features the following calibration modes: Humidity: 2, 3 or 4 points Temperature: 2 points 1-point adjustment function (offset) for both humidity and temperature When adjusting humidity against a ROTRONIC humidity standard, HW4 automatically corrects the value of the standard to reflect the temperature of calibration (see note). HW4 also offers the possibility of saving and printing a probe adjustment protocol. ROTRONIC HygroGen: this humidity-temperature generator is primarily designed for the calibration of humidity instrumentation. It is completely self-contained, requiring no external resources except mains power, and is light enough to be portable for use on-site. Suitable for all types of humidity-temperature probes Fast equilibrium to move from one condition to another Generates an extremely stable humidity and temperature environment Smart chamber design minimizes temperature and humidity gradients Range: 5 to 50°C and 5 to 95 %RH Chamber accepts up to five probes Data loggers can be inserted in the chamber Available with different models of chamber door Stainless steel enclosure   Certified Humidity Standards: if you do not have access to a humidity generator, the ROTRONIC humidity standards offer a reliable and convenient way to generate a reference humidity condition during probe calibration. The ROTRONIC standards are shipped with an internationally accepted certificate, meeting in full the requirements of quality systems such as ISO 9000. The standards are available in boxes of 5 glass ampoules of the same value, and can be stored indefinitely. Standards in the range of 5 to 95 %RH are non-saturated aqueous salt solutions. The 0 %RH humidity standard is made of small granules of a highly porous ceramic. A Material Safety Data Sheet is available for each standard. Note: the value of the standards does not depend on barometric pressure (altitude).   Calibration Devices: a calibration device is a small airtight container that fits on the probe and seals around the humidity sensor. During calibration, a known reference humidity is produced inside the calibration device by means of a humidity standard.