No measuring instrument stays accurate by itself. It is essential that the functioning of an instrument is periodically checked against a reference.

The Vaisala Humidity Calibrator HMK15 makes calibration and spot checking of humidity probes and transmitters easy and reliable. The operating principle of the HMK15 is based on the fact that a saturated salt solution generates a certain relative humidity in the air above it. The reading of the humidity probe or transmitter can then be adjusted accordingly.

The package includes:

• Two salt chambers, chamber covers and transportation covers
• Base plate
• Calibrated precision mercury thermometer
• Measurement cup and mixing spoon
• Certified and pre-measured packed salts: LiCl (11%RH) and NaCl (75%RH)
• Ion-exchanged water
• Soft insulated carrying bag
• Easy and reliable calibration of humidity probes and transmitters
• Based on saturated salt solutions
• Suitable for laboratory use and on-site checks