AC Tool Supply RH350 User Manual Download Page 2

RH350-en-GB_V2.5   11/14 

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Introduction 

Thank you for selecting the Extech Model RH350. This device is shipped fully tested and calibrated 
and, with proper use, will provide years of reliable service. Please visit the Extech Instruments 
website to check for the latest version of this User Guide.   

Meter Description 

1.

Humidity Sensor & Air Temperature Sensor

2.

Triple LCD Display

3.

On/Off; Set Mode

4.

Min/Max/Average; Reset Min/Max

5.

Air, T1, Air-T1, Dew Point

6.

T1 probe input

7.

T2 probe input

8.

T1-T2, T2, T1-Dew Point, Wet Bulb

9.

Store Current Reading; Backlight

10. Hold; Recall Mode
11. RS232 

port

Note: The battery compartment is located  

on the rear of the instrument 

Display Description

 

1.

Air, T1, Air-T1, Dew Point, Low Battery

2.

Temperature 

°C/°F

3.

T2, T1-T2, T1-Dew Point, Wet Bulb

4.

Temperature 

°C/°F

5.

Date (month, day, year), Time (24 hour clock)

6.

Memory Store/Recall Location

7.

Relative Humidity %

8.

Maximum, 

Minimum

9.

Hold, 

Average

1

2

3

4

5

6

7

8

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