PHB-3 Pocket pH Tester Instruction Manual
1. Brief Introduction
Thank you for purchasing APERA INSTRUMENTS’ PHB-3 Pocket pH Tester. This tester is simply
the most economical choice of a reliable pocket pH tester for your regular liquid's pH
measurement, including hydroponics, aquaculture, pools & spas, home brewing, education,
tap/drinking water, etc.
2. Specifications
1) pH Range: 0 ~ 14.0 pH
2) Resolution: 0.1 pH
3) Accuracy: ± 0.1 pH, ±1 digit
4) Automatic calibration: 1-point calibration (pH 7.00)
5) Power：2 AAA Batteries, for 1000 hours of use
6) Dimension and Weight：39×25×176 mm / 87 g
7) Waterproof rating: IP57
3. Instructions
1) Calibration: Rinse the probe in distilled water and dry it. Dip the probe in the standard buffer
solution pH7.00. Stir gently, hold still, and wait for the reading to become stable. Then press the
CAL button for two seconds until CAL appears on the screen. When the calibration value 7.0
flashes, the calibration is complete and END will appear on the screen.
2) Measurement: Rinse the probe in distilled water and dry it. Dip the probe in the sample
solution. Stir gently and wait until you receive a stable reading.
3) After measurement, rinse the probe with distilled water, dry it, and put the protection cap back
on.
4. Notes
1) The instrument can be continuously used for 1 to 2 weeks (or longer) after calibration.
2) The sponge in the protection cap should always be kept wet by adding a few drops of distilled
water in order to keep the probe activated.
3) To ensure the reliability of calibration, pH standard buffer solution should be replaced once it
becomes contaminated.
4) Maintenance is necessary for the head of the probe because it can become contaminated
after long-term use. To do the maintenance, wash the bulb and surrounding area with a small soft
brush and soap water. Then rinse the bulb with distilled water, and redo calibration after several
hours.
5) The instrument will be power off automatically without operation after 10 minutes.
6) Replace the batteries when appears on screen.
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