Velleman DVM8681 Mode D'emploi page 8

6. If the meter successfully recognizes the test solution, the
solution pH value (4, 7 or 10) will appear on the display. If
the displayed value differs slightly from the supposed value,
e.g. 4.01 instead of 4.00, press HLD to change the value. The
adjustable calibration range for pH 4 is 3.50 ~ 4.50, for pH 7
is 6.50 ~ 7.50 and for pH 10 is 9.50 ~ 10.50.
7. A stable value will automatically be saved.
8. Cleaning and Maintenance
 Avoid touching the probe with bare hands and keep it wet by
moistening the sponge in the cap.
 Rinse the probe with tap water or better, de-ionized water after
each measurement.
 Remove the batteries from the meter if not used for a long time.
9. Troubleshooting
 No display after power-on
Check the batteries. Replace them if necessary (see "6. Battery
Installation").
 Slow response
Clean the probe thoroughly with tap water and rinse with de-
ionized water afterwards.
 Display indicates "- - -"
The pH value is out of the pH range (pH 0 ~ pH 14). The solution
is either too acid or too alkaline.
 The displayed pH value is unstable
The probe is exposed. Dip it in the solution to be measured.
10. Technical Specifications
accuracy
pH range
temperature accuracy
temperature resolution
resolution
ATC
self-calibration
V. 03 – 15/10/2018
DVM8681
0.2 pH
0 - 14
± 1°C
0.5°C/°F
0.1 pH
yes
yes
8 ©Velleman nv