SPECIFICATIONS
Range pH 0.00 to 14.00
EC 0 to 3999 µS/cm
TDS 0 to 2000 ppm
Temperature 0.0 to 60.0°C or 32.0 to 140.0°F
Resolution pH 0.01pH
EC 1 µS/cm
TDS 1 ppm
Temperature 0.1°C or 0.1°F
Accuracy pH ±0.01pH
(@20°C/68°F) EC/TDS ±2% F.S.
Temperature ±0.5°C or ±1°F
Typical EMC pH ±0.03pH
Deviation EC/TDS ±2% F.S.
Temperature ±0.5°C or ±1°F
Temperature pH Automatic
Compensation EC/TDS ß = 0.0 to 2.4%/°C
pH Calibration 1 or 2 point with auto-buffer recognition
4.01/7.01/10.01 pH or 4.01/6.86/9.18 pH
EC/TDS Calibration Automatic (25°C/77°F) 1 point at:
1413µS/cm, 1382 ppm (0.5 conv.), 1500 ppm (0.7 conv.)
Conductivity to TDS 0.45 to 1.00 (CONV)
Conversion Factor
Probe HI 1288 pH/EC/TDS/temp. probe (included)
Battery Type/Life 4 x 1.5V AAA with BEPS / 500 hours
Environment 0 to 50°C (32 to 122°F); RH 100%
Dimensions 143x80x38mm (5.6x3.2x1.5”)
OPERATIONAL GUIDE
To connect the probe
Connect the HI 1288 probe to the DIN socket on the top of
the meter by aligning the pins and pushing in the plug.
Tighten the nut to ensure a good connection. Remove the
protective cap from the HI1288 probe before taking any
measurement.
To turn the meter on and to check battery status
Press and hold the ON/OFF/MODE button for 2 seconds.
All the used segments on the LCD will be visible for a few
seconds, followed by a percent indication of the remaining
battery life. Eg. % 100
BATT.
To select the measurement unit (pH or EC or TDS)
Press the SET/HOLD button while in normal measurement
mode. The meter will display pH or EC or TDS.Temperature
will always be displayed on the bottom. Eg. pH 5.73 22.5 °C.
To freeze the display
Press and hold the SET/HOLD button until HOLD appears
on the secondary display. Eg. pH 5.73 hold.
Press either button to return to normal mode.
To turn the meter off
Press and hold the ON/OFF/MODE button while in normal
measurement mode. OFF will appear on the lower part of
the display. Release the button.
HI 991300 Instruction Manual
Portable pH/EC/TDS/Temperature Meter
Eg. TEMP °C.
Use the SET/HOLD button to change the temperature unit,
and then press the MODE button three times, until the meter
returns to normal measurement mode.
To reset to the default calibration
To clear a previous calibration, press the MODE button af-
ter entering the calibration mode. The lower LCD will dis-
play ESC for 1 second and the meter will return to normal
measurement mode. The “CAL” symbol on the LCD will
disappear. The meter will be reset to the default calibration.
Battery replacement
The meter displays the remaining battery percentage every
time it is turned on. When the battery level is below 5%, the
- +
symbol on the bottom left of the LCD lights up to indi-
cate a low battery condition. If the battery level is so low as
to cause erroneous reading, the Battery Error Prevention
System (BEPS) will automatically turn the meter off.
To change the batteries, remove the 4 screws located on
the back of the meter. Once the back has been removed,
carefully replace the 4 AAA batteries located in the compart-
ment while paying attention to their polarity. Replace the
back, making sure that the gasket is properly seated in
place, and tighten the screws.
Calibration solutions
HI 77400P pH 4.01 & 7.01 solutions, 20 mL sachets (5 each)
HI 770710P
pH 7.01 & 10.01 solutions, 20 mL sachets (5 each)
HI 70004P pH 4.01 solution, 20 mL sachet (25 pcs)
HI 70006P pH 6.86 solution, 20 mL sachet (25 pcs)
HI 70007P pH 7.01 solution, 20 mL sachet (25 pcs)
HI 70009P pH 9.18 solution, 20 mL sachet (25 pcs)
HI 70010P pH 10.01 solution, 20 mL sachet (25 pcs)
HI 77100P pH 7.01 & 1413 µS/cm @25°C (20 mL, 10 pcs each)
HI 77200P pH 7.01 & 1500ppm @25°C (20 mL, 10 pcs each)
HI 77300P pH 7.01 & 1382 ppm @25°C (20 mL, 10 pcs each)
HI 70031P 1413 µS/cm @25°C solution, 20 mL sachet (25 pcs)
HI 70442P 1500 ppm @25°C solution, 20 mL sachet (25 pcs)
HI 70032P 1382 ppm @25°C solution, 20 mL sachet (25 pcs)
Other accessories
HI 710007 Protective rubber boot
HI991300 is in compliance with the CE directives.
IS991300R3 11/00
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