User Manual

8
8.3.3 Automatic Lock (P4)
Select “On” to activate auto lock function. When reading is stable for more than 10 seconds, the tester will
lock the value automatically, and HOLD icon will display on LCD. Short press key again to cancel the lock.
8.3.4 Backlight (P5)
“Off”-turn off backlight, “On”-always turn on backlight, “1”- backlight will last for 1 minute.
8.3.5 Temperature Unit (P6)
Select between C˚ and F˚.
8.3.6 Factory default setting (P7)
Select “Yes” to recover instrument calibration to the theoretical value (pH value in zero potential is 7.00pH,
slope is 100%), parameter setting return to initial value. This function can be used when instrument does not
work properly in calibration or measurement. Calibrate and measure again after recovering the instrument to
factory default status.
9 ORP Measurement
ORP stands for Oxidation-Reduction Potential. ORP is a measure of the cleanliness of the water & its ability to
break down contaminants. An ORP probe is needed to test ORP (sold separately, SKU: AI1207). After powering
on the tester, press to enter ORP mode (mV). Rinse the probe in distilled water and dry it. Dip the probe
in your sample solution, make a quick stir, and hold still. Record the reading after it is fully stabilized.
10 Technical Specifications
pH
Measuring Range
-2.00 – 16.00 pH
Resolution
0.01pH
Accuracy
±0.01pH ±1 digit
Calibration Points
1 – 3 points
Automatic Temperature Compensation (ATC)
0 – 50˚C
(32 – 122˚F)
ORP (mV)
Measuring Range
± 1000mV
Resolution
1mV
Accuracy
±0.2% F.S
Temp.
Measuring Range
0 – 50˚C (32 – 122˚F)
Resolution
0.1˚C
Accuracy
±0.5˚C