User Manual

Notes

a) Avoid testing in very high (>113°F) or very low (<41°F) temperature solutions as it will cause greater

measurement error and potential damage to the probe. Test your samples and perform calibration

close to room temperature as much as possible.

b) NEVER store the probe in pure water like tap, RO, distilled, or deionized water as they could damage

the pH probe. If this happens, immediately soak the pH probe Apera 3M KCL soaking solution

overnight, then re-calibrate it before using. Pure water is only for rinsing the probe.

c) Never use your finger to touch the glass membrane or use other material to rub it. Doing so could

generate static electricity and cause measurement errors. Never test oily liquids.

d) Make sure the battery cap is completely closed with the red O-ring. Otherwise, the waterproof rating

could be compromised.

Battery Installation

Please install batteries according to the following steps. *Please note direction of batteries: All

POSITIVE SIDES (“+”) FACING UP. (Wrong installation of batteries will cause damage to the

tester and potential hazards)

① Pull the battery cap up

② Slide the battery cap along to the direction of arrow

③ Open the battery cap

④ Insert the batteries (ALL POSITIVE SIDES FACING UP) (see graph)

⑤ Close the battery cap

⑥ Slide and lock the battery cap along to the direction of arrow

⑦ Fit the tester’s cap while making sure to push all the way down. The

tester’s waterproof design may be compromised if the cap is not fitted

correctly.