AMTAST AMT28 User Manual

No Calibration Pen Type pH Tester AMT28
Quick Step for Use:
1. First time use or long time not use, turn off the meter and put
sensor in the sample liquid or tap water (don't put sensor in
distilled water) for about 2-5 minutes. Shake it gently in the water.
2. Long press ON/OFF button to start test, meter will display pH and
temperature value alternately. Value will automatic hold when
stable.
3. Short press ON/OFF, meter will test again.
4. Long press ON/OFF meter will shut off.
5. After 5 months or accuracy not good, meter in shut down state,
long press about 15 seconds, till meter display "dEFA", release
button and meter will reset to factory default.
Calibration (No need, this function only for professional user or
meter work wrong!)
1. Though this meter no need calibration and easy to reset to factory
default, it also can calibration by professional user.
2. Shut down meter, put sensor in the 6.86 buffer solution, shake it
gently and wait for 2 minutes.
3. Long press ON/OFF about 10 seconds till meter display "CALI",
meter will automatic calibration and no need any operation. After
calibration finish, meter will turn off.
Maintenance:
1. Always clean the sensor after use by tap water.
2. Check the battery compartment to avoid water into or battery
leakage.
AMTAST USA INC.
438 Skyline Dr. E Lakeland FL. 33809 USA
USER GUIDE