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The meter is also provided with BEPS (Battery Error 
Prevention System), which avoids any erroneous 
readings due to low battery level by automatically 
switching the meter off.
It is recommended to replace the batteries 
immediately.
To replace the batteries unscrew the battery 
compartment cap and replace all four 1.5V batteries 
while paying attention to their polarity. Make sure 
the gasket is in place before screwing back the cap.
Batteries should only be replaced in a non-
hazardous area using the battery type specified in 
this instruction manual.

ACCESSORIES

MI58P

Replaceable electrode for 

pH58

M10004B

pH 4.01 buffer, 20 ml sachet, 25 pcs.

M10007B

pH 7.01 buffer, 20 ml sachet, 25 pcs.

M10010B

pH 10.01 buffer, 20 ml sachet, 25 pcs.

MA9004

pH 4.01 buffer, 230 ml bottle 

MA9006

pH 6.86 buffer, 230 ml bottle

MA9007

pH 7.01 buffer, 230 ml bottle

MA9009

pH 9.18 buffer, 230 ml bottle

MA9010

pH 10.01 buffer, 230 ml bottle

MA9015

Electrode storage solution, 230 ml

MA9016

Electrode cleaning solution, 230 ml

M10000B

Electrode rinse solution, 20 ml sachet, 

25 pcs.

CERTIFICATION

Milwaukee Instruments conform to the CE European 

Directives.

 

Disposal of Electrical & Electronic Equipment.

 Do not 

treat this product as household waste. Hand it over to the 

appropriate collection point for the recycling of electrical 

and electronic equipment.

Disposal of waste batteries.

 This product contains 

batteries. Do not dispose of them with other household 

waste. Hand them over to the appropriate collection point 

for recycling.

Please note: proper product and battery disposal prevents 

potential negative consequences for human health 

and the environment. For detailed information, contact 

your local household waste disposal service or go to 

www.milwaukeeinstruments.com

 (USA & CAN) or 

www.milwaukeeinst.com

.

SPECIFICATIONS

RANGE

 

-2.00 to 16.00 pH; 

±1000 mV (ORP);

 -5.0 to 60.0°C / 23.0 to 140.0°F

RESOLUTION

 

0.01 pH; 

1 mV; 

0.1°C / 0.1°F

ACCURACY (@25°C)

 

±0.05 pH; 

±2 mV; 

±0.5°C / ±1°F

TYPICAL EMC DEVIATION

 

±0.02 pH; 

±2 mV; 

±0.3°C / ±0.6°F

TEMPERATURE COMPENSATION

 Automatic, 

 

from -5 to 60°C

pH CALIBRATION

 

Automatic, 1 or 2 points 

with 2 sets of memorized buffers 

(pH 4.01, 7.01, 10.01 or 4.01, 6.86, 9.18)

ORP CALIBRATION

 

Factory calibrated

PROBE

 Replaceable 

MI58P

ENVIRONMENT

 

-5 to 50°C; 100% RH max.

BATTERY TYPE

 

4 x 1.5V; IEC LR44, A76

BATTERY LIFE

 

approx. 250 hours of use

AUTO-OFF

 

after 8 minutes of non-use

DIMENSIONS

 

200 x dia 38 mm

WEIGHT

 

100 g

RECOMMENDATION

Before using this product, make sure it is entirely suitable for 

your specific application and for the environment in which it is 

used. Any modification introduced by the user to the supplied 

equipment may compromise the meter’s performance. For 

your and the meter’s safety do not use or store the meter 

in hazardous environment. To avoid damage or burn, do not 

perform any measurement in microwave ovens.

WARRANTY

This instrument is warranted against defects in materials 

and manufacturing for a period of 2 years from the date of 

purchase. Probe is warranted for 6 months This warranty 

is limited to repair or free of charge replacement if the 

instrument cannot be repaired. Damage due to accidents, 

misuse, tampering or lack of prescribed maintenance is 

not covered by warranty. If service is required, contact 

your local Milwaukee Instruments Technical Service. If the 

repair is not covered by the warranty, you will be notified of 

the charges incurred. When shipping any meter, make sure 

it is properly packaged for complete protection.

Milwaukee Instruments reserves the right to make 

improvements in design, construction and appearance of 

its products without advance notice.

ISTPH58 07/20

USER MANUAL

SATISFACTION

GUARANTEED

milwaukeeinstruments.com (USA & CAN)

milwaukeeinst.com

pH58

PRO Waterproof

pH/ORP/Temperature

Tester

ON/OFF

CAL

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HOLD

pH58

pH/ORP/

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