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WARNING: 

To avoid electric shock, do not operate the meter until the 

battery cover is in place and

 

fastened securely. 

 

NOTE:

: If your meter does not work properly, check the fuses and batteries 

to make sure that they are

 

still good and that they are properly 

inserted. 

 

Calibration 

 

A humidity calibration adjustment is located in the battery compartment. 

 

1.  Remove the battery door and move the battery to one side. 

 

2.  Place the humidity probe in a humidity chamber or humidity calibration 

bottle and wait 20 minutes 

 

3.  Turn the meter on and turn the adjustment until the humidity reading 

on the display agrees with the calibration source. 

 

 

Specifications 

 

 

Function 

Range and Resolution 

Accuracy 

 

Humidity 

10.0 to 95.0% RH 

± 3.5% RH 

 

Air 
Temperature 

-20 to 60

o

C (-4 to 140

o

F) 

± 2.0

o

C (± 3.0

o

F) 

 

IR 
Temperature 

-50.0 to -20.0

o

C (-58.0 to -

4.0

o

F) 

± 5

o

C (± 9

o

F) 

 

 

-20.0 to 93.3

o

C (-4.0 to 

199.9

o

F) 

± 2% of rdg or ± 2

o

C (± 

4

o

F) 

 

 

93

o

C to 204

o

C (200 to 

400

o

F) 

 

 

 

 

 

204

o

C to 500

o

C (400 to 

932

o

F) 

± 3% of rdg 

 

Display 

 

Dual LCD with Backlight and status indicators 

Sensor Type 

 

Humidity: Precision capacitance sensor 

 

 

Temperature: Thermistor (probe) and InfraRed 

Summary of Contents for RHT70

Page 1: ...User Manual RHT70 Hygro Thermometer IR Thermometer...

Page 2: ...r for convenient targeting Safety Use extreme caution when the laser pointer beam is on Do not point the beam toward anyone s eye or allow the beam to strike the eye from a reflective surface Do not u...

Page 3: ...s represent Air Probe Temperature Indicates that the laser pointer is on IR TEMP Indicates that the larger LCD digits represent IR temperature measurement MAX bottom of LCD Max Hold for the IR Tempera...

Page 4: ...ed 3 Press and hold the large red IR button to begin measuring the surface temperature of a desired target IR TEMP and will appear on the display The laser pointer will switch on to help aim the meter...

Page 5: ...ote that in IR temperature mode Data Hold is automatically engaged when the red IR button is released MAX Buttons Press the MAX button bottom of meter for Air Temperature center of meter for IR temper...

Page 6: ...ments To find a hot spot aim the meter outside the area of interest then scan across in an up and down motion until the hot spot is located IR Theory IR thermometers measure the surface temperature of...

Page 7: ...of the meter 4 Remove the small Phillips head screw on the rear of the meter 5 Open the battery compartment and replace the 9V battery 6 Re assemble the meter before operating Never dispose of used ba...

Page 8: ...chamber or humidity calibration bottle and wait 20 minutes 3 Turn the meter on and turn the adjustment until the humidity reading on the display agrees with the calibration source Specifications Funct...

Page 9: ...80 RH non condensing Power Supply 9V Battery with auto power off after 10 minutes Battery Life Approx 24 hours if Backlight and Laser are used continuously the battery life is reduced to 2 to 3 hours...

Page 10: ...f purchase This warranty does not apply to any of our products which have been repaired or altered by unauthorized persons in any way or purchased from unauthorized distributors so as in our sole judg...

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