Hanna Instruments hi 991000 User Manual

0.00÷14.00

Temperature 0.0÷60.0°C or 32.0÷140.0°F

0.01pH

0.1°C or 0.1°F

±0.01pH

±0.5°C or ±1°F

±0.03pH

±0.5°C or ±1°F

Automatic

1 or 2 point with auto-buffer recognition

pH 4.01/7.01/10.01  or  pH 4.01/6.86/9.18

HI 1291 pH/temperature probe (included)

4 x 1.5V AAA with BEPS / 500 hours

0 to 50°C (32 to 122°F); RH 100%

143x80x38mm (5.6x3.2x1.5”)

ppm  ppt  µS  pH

!

A T C

%

CAL

-    +

°C
°F

Primary
display

Secondary
display

Selectable
temperature
unit

Stabilty
indicator

Battery
percentage

Low battery
indicator

    IS991000R2   11/00

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The meter displays the remaining percentage when turned
on. When the battery level is below 5%, the 

-    +

 symbol on

the bottom left of the LCD lights up to indicate a low battery
condition. If the battery level is low enough to cause errone-
ous readings, the Battery Error Prevention System (BEPS)
turns the HI 991000 off.

To ensure a watertight seal, the batteries are accessed by
separating the front and back halves of the meter. The
4 Philips-head screws are located on the 4 corners of the
back of the meter. Once the back has been removed, care-
fully replace the 4 AAA batteries located in the battery com-
partment, paying attention to their polarity. Re-attach the
back, making sure that the gasket is in place.

pH 4.01 & 7.01 (20 mL, 5 pcs each)

pH 7.01 & 10.01 (20 mL, 5 pcs each)

pH 4.01 calibration solution (20 mL, 25 pcs)

pH 6.86 calibration solution (20 mL, 25 pcs)

pH 7.01 calibration solution (20 mL, 25 pcs)

pH 9.18 calibration solution (20 mL, 25 pcs)

pH 10.01 calibration solution (20 mL, 25 pcs)

Protective rubber boot

HI 991000 is in compliance with the CE directives

EN 50081-1, EN 50082-1 and EN 61010-1.