407227 Datasheet, PDF (5/6 Pages) Extech Instruments Corporation. – Heavy Duty pH, mV, & Temperature Meter

Advanced Features
MIN MAX AVG Record / Recall Mode
1. Press the RECORD key (the REC indicator will appear on the LCD).
2. Press the CALL key to view the highest (MAX) reading recorded since the RECORD
key was first pressed. The MAX indicator will appear on the LCD.
3. Press the CALL key to view the lowest (MIN) reading recorded since the RECORD key
was first pressed. The MIN indicator will appear on the LCD.
4. Press the CALL key to view the average (AVG) reading recorded since the RECORD
key was first pressed. The AVG indicator will appear on the LCD.
5. Press the RECORD key again to exit this mode.
6. Note that the Auto Power OFF feature is disabled in this mode.
Automatic Power OFF Feature
This meter is equipped with a battery conservation feature that automatically shuts off the
power after approximately 10 minutes. To defeat this feature, put the meter in the MIN
MAX AVG Record / Recall mode by pressing the RECORD key. To turn the meter off, exit
the Record mode first (by pressing the RECORD key until the RECORD display icon
switches off) and then pressing the POWER key.
Data Hold
Press the HOLD key to freeze the displayed reading. The DH indicator will switch on in the
Data Hold mode. Press the HOLD key again to exit the Data Hold mode and the DH
indicator will switch off.
RS-232 Serial PC Interface
The 407227 is equipped with an RS-232 serial data port. This interface was designed to
operate with the Extech Data Acquisition Software (Part Number 407001). For detailed
information contact your distributor or refer to the 407001 manual.
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Model 407227 Ver. 2.1 Oct. 2002