
Hu-19
Common Features
⻬ Magnified Display 
⻬ Separate Battery
Compartment
⻬ RH Accuracy ±1.5% 
⻬ 0 to 80°C (32 to 176°F)
RH-202 Features
⻬ Waterproof to IP65 
(With Plug Connected)
⻬ Backlight 
⻬ Auto Switch-Off 
⻬ °C/°F/RH Selection Button
RH-202L Features
⻬ Connector for Type K
Thermocouple
⻬ Max/Min Averaging 
⻬ Display Hold 
⻬ Logging (250 Readings
on Demand or 
Pre-Set Interval)
⻬ Data Store with 4-Digit
Data Code Input
⻬ Dew Point Measurement 
⻬ Auto Range/Range Lock
A New Range 
of Handheld Relative 
Humidity Instruments
The range has been specifically 
designed in response to demand 
for the effective and reliable 
measurement of controlled 
environments. Featuring 2 models, 
RH-202 and RH-202L with the latter 
including functions: dew point, 
calculation, separate thermocouple 
input and logging.
Performance
The RH-202 meters from 
OMEGA®offer the user the 
highest accuracies for a budget 
price. The ergonomic case design 
with advanced technology 
sensors combine to give an 
instrument with excellent 
performance and long life.
The RH-202L features an 
external temperature probe 
option for pinpoint temperature 
measurement. 250 readings 
can be logged, replayed on the 
screen and output to a printer 
or PC using the HHP-2000-DL. 
Each reading is user coded and 
time and date stamped.
Dew Point
The dew point is defined as the 
lower temperature to which air must 
be cooled in order for condensation 
(saturation) to occur. The dew point 
is dependent on the concentration 
of water vapor present, and, 
therefore, the relative humidity.
Simple Data Collection 
and Analysis
The RH-202L features special 
logging functions that enable 
readings to be taken, stored, 
retrieved and downloaded in the 
shortest possible time. This reduces 
the risk of clerical errors and saves 
writing and keying-in time when 
analysis is needed.
Logging on Demand
Logging on Demand allows 
readings to be stored when 
required, with the ability to add a 
4-digit reference number (including 
decimal point) to each reading and 
record the date and time each 
reading is taken. This function is 
excellent for helping you cut down 
on paperwork and clerical errors. It 
is ideally suited to tasks where you 
wish to maintain a record of the time 
and date when a temperature was 
taken.
Pre-Set Interval Logging
Pre-set interval logging lets you 
determine the frequency at which 
readings are taken. Once the 
instrument has been set, readings 
are taken automatically at the 
interval you decide (from once every
RH-202 Series
Starts at
$
581
RH-202L, $733, 
shown actual size.
Handheld Relative 
Humidity Meters
This model includes a free 1 m (40") 
Type K insulated beaded wire thermocouple 
with subminiature connector and wire spool 
caddy. Order a Spare! 
Model No. SC-GG-K-30-36, $15.
Free Thermocouple 
Included!
Optional
†
† Refer to footnote on page Hu-20 for 
NIST calibration ordering information.

Hu-20
H
u
Model No. Price Description
CAL-3-HU
†
$125 NIST-traceable calibration
HHP-2000-DL 149 Infrared download box and data link
OM-MLWIN 20
Windows software (requires 4MB RAM 
and Windows 3.1X or 95)
HHP-2000-RB 42 Spare rubber boot
Accessories
Specifications RH-202 RH-202L
Sensor(s) Pt100 + capacitive RH sensor
Pt100 + capacitive RH sensor 
input for Type K thermocouple (SMP type)
Range
0 to 100% RH, -10 to 100°C  0 to 100% RH, -10 to 100°C 
(+14 to 212°F) (+14 to 212°F)
Resolution 0.1% RH, 0.1°
RH 0.1%, Temperature 0.1° from
-199.9 to +199.9°, 1° elsewhere
Accuracy
±1.5% RH, 0 to 100% non-condensing ±1.5% RH, 0 to 100% non-condensing 
±0.5°C (1°F) 0 to 80°C (32 to 176°F) ±0.5°C (1°F) 0 to 80°C (32 to 176°F) 
All ±1 digit All ±1 digit
±0.2% reading ±2 digits for K thermocouple input
Operating Temperature 0 to 50°C 0 to 50°C 
Operating Humidity 0 to 100% RH (non-condensing) 0 to 100% RH (non-condensing) 
Battery Type 2 (AA) or equivalent cells (included) 2 (AA) or equivalent cells (included) 
Battery Life Typically 150 Hours Typically 150 Hours 
Low Battery Check symbol appears on display symbol appears on display 
Display 12.7 mm (0.5") custom LCD 12.7 mm (0.5") custom LCD 
Back Light Yes Yes 
Environmental
IP65 with plug connected
Specifications 
Dimensions 155 H x 67 W x 40 mm D (6.1 x 2.6 x 1.6") 155 H x 67 W x 40 mm D (6.1 x 2.6 x 1.6") 
Weight 180 g (6.4 oz) 180 g (6.4 oz)
To Order 
(Specify Model Number)
Model No. Price Description
RH-202 $581 Handheld thermohygrometer 
RH-202L 733 Handheld thermohygrometer with data logging
Comes complete with RH/Temp probe, rubber boot, 2 “AA” batteries and operator’s manual.
Ordering Examples: RH-202, handheld thermohygrometer, $581. 
RH-202L, handheld thermohygrometer with data logging, plus CAL-3-HU, NIST traceable
calibration, and OM-MLWIN, Windows software, $733 + 125 + 20 = $878.
minute to once every 24 hours), 
providing an excellent means of 
troubleshooting and examining 
trends over a given period of time. 
With preset interval logging, you 
really can “set it, forget it” as the 
instrument will continue logging until 
a maximum of 250 readings are 
taken or your data is downloaded.
Data Analysis
Data can be viewed and analyzed 
direct from the magnified display. By 
simply pressing a few keys you can 
scroll through your readings with 
ease. You may then download the 
data to a PC or Epson compatible 
printer via OMEGA’s HHP-2000-DL. 
Data can then be analyzed using 
our OM-MLWIN.
Data Download 
with the HHP-2000-DL
Access to stored information is 
gained via OMEGA’s infrared 
HHP-2000-DL, which is designed 
to give users a quick and simple 
means of retrieving and 
downloading data. Information can 
be output direct to either an Epson 
compatible printer for immediate 
study or downloaded to a PC for 
more detailed analysis.
Data Analysis with 
OM-MLWIN for Windows
®
OMEGA®has created a Windows 
software package enabling 
information to be put into 
spreadsheets and charts for 
incorporating into reports and other 
documents. Even separate reports
Minimum PC requirements: 
386, 4MB RAM running with either
Windows 3.1X or Windows 95.
from different units can be merged 
to produce one report. 
PC analysis really couldn’t be any 
simpler. By following the software’s 
simple menu instructions, you will 
find it easy to view and manipulate 
information to your individual 
requirements. For example, once a 
logging session is complete, all you 
need to do in order to gain access to 
information stored within the 
instrument is position the PC’s 
cursor over the “Retrieve Data” 
menu icon, click once and press a 
button on the instrument. 
Information is then automatically 
transferred, via the infrared link and 
stored within the computer.
You may display the retrieved 
information in graph format by 
positioning the cursor over the 
“Display As Graphical Data” menu 
icon and click again. You can 
access the graph produced to 
highlight certain areas or key data 
points, prior to printing or exporting 
the graph into other software 
packages.
Furthermore, all graphs show the 
identification number of the 
instrument used, enabling data to 
be cross-checked against 
calibration records helping to ensure 
full traceability.
AVAILABLE FOR FAST DELIVERY!

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