2 SDL550-EU-EN V1.4 3/14
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Introduction
Congratulations on your purchase of the Extech SDL550 Humidity Content Meter. This meter
displays and stores Humidity Content readings, Air Temperature, Dew Point Temperature, and Wet
Bulb Temperature. Logged data readings are stored on an SD card for transfer to a PC. In addition,
an RS232 port allows data streaming to a PC. This meter is shipped fully tested and calibrated and,
with proper use, will provide years of reliable service.
Safety
International Safety Symbols
This symbol, adjacent to another symbol or terminal, indicates the user must refer to the
manual for further information.
Meter Description
1. Thermocouple Temperature Probe input jack
2. Humidity Sensor input jack
3. Primary LCD Display digits
4. Unit of Measure for Primary Display
5. HOLD and Backlight
key
6. MAX-MIN key
7. SET and Clock
key
8. PC interface jack
9. Reset button
10. Power Adaptor jack
11. SD card slot
12. ENTER and LOG key
13. Down arrow ▼ / FUNCTION key
14. Up arrow ▲ key
15. Power ON-OFF
key
16. Secondary LCD Display digits with unit of measure
Notes: Items 8, 9, and 10 are located behind the snap-off compartment cover on meter’s right side.
Battery compartment, tilt stand, and tripod mount are located on the rear of the instrument
