Comparing humidity generators

How to make the best choice

Making accurate humidity measurements can prevent expensive product spoilage in industries like pharmaceuticals, medical devices, semiconductors, chemicals, and food production. To choose the best humidity generator for your application, compare the available solutions.

5128A Calibrator product image

The 5128A RHapid-Cal Humidity Generator calibrates humidity probes and loggers with accredited 1% RH system accuracy, in the lab or in the field.

It calibrates humidity probes 33% faster than a two-pressure generator and has significant competitive advantages over other solutions as well.

Free price quote

Compare the 5128A generator with these other solutions:

5128A RHapid-Cal


Handheld humidity meters

Multi-point calibrations

Supports on-site multi-point humidity probe calibration


Only calibrates one point. One-point tests may cause out-of-tolerance readings when ambient conditions change.

Fast calibrations

Calibrates up to five probes at once

Fast stabilization time when changing temperature and humidity test points


Calibrates one sensor at a time

Reliable calibrations

Stable test environment

Excellent accuracy, stability and uniformity

Control temperature and humidity settings over a wide range


Temperature differences between the meter and its environment, technician body heat, and moisture from breath can all cause RH measurement errors.

5128A RHapid-Cal


Two-pressure generators

Heating and cooling times

10 °C/minute heating times

1.5 °C/minute cooling times


Check the specifications; 5128A is faster than two-pressure generators

RH increase/decrease response times

10% RH/minute increase response time

5% RH/minute decrease response time


Many generator manufacturers do not specify RH response times

Chamber uniformity

Mixing insert circulates air in the chamber to achieve excellent temperature and humidity uniformity

Specifications for ambient temperature range (18 °C to 28 °C, 7 to 95 % RH) are humidity uniformity ±0.3 % RH and temperature uniformity ±0.12 °C.


Many generator manufacturers do not specify humidity uniformity

5128A RHapid-Cal


Other portable humidity generators

RH system accuracy

Best-in-class humidity system accuracy of ± 1.0 % RH (7 % to 80 % RH, 18 °C to 28 °C) which includes all known sources of error such as stability, uniformity, drift, and calibration uncertainty


Most competing generators don’t specify system accuracy. Their specifications can be complicated and confusing, making it difficult to know how to apply them to a particular calibration process.

Accredited system calibration

ISO 17025 accredited system calibration included standard


Not provided by most suppliers

Seven key reasons to choose the 5128A RHapid-Cal Humidity Generator


Best-in-class system accuracy for dependable humidity probe calibration


Perform a six-point calibration in two hours


Supports on-site, multi-point calibration of humidity probes


Versatile design accommodates a large workload—calibrating up to five RH probes at a one time


Compact size and lightweight for easy transport


ISO 17025 accredited system calibration Included standard


Easy to maintain—only clean distilled water is needed to operate

Compare humidity generators and then make the best choice. Get your free price quote on the 5128A RHapid-Cal Humidity Generator.

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