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HM Digital pH-200 Waterproof pH Meter Ideal for all pH testing, water purification applications, wastewater regulation, aquaculture, hydroponics, colloidal silver, labs & scientific testing, pools & spas, ecology testing, boilers & cooling towers, water treatment, wine, coffee, agriculture and more. Features: Measures pH and Temperature Auto-ranging three point calibration with digital fine tuning Includes storage solution in a sponge embedded in a clear cap Waterproof housing (IP-67 rating) Simultaneous temperature display Measurement Range: 0-14 pH Digital automatic calibration (one point), with digital fine tuning Auto-off function, data-hold function and low-battery indicator Display: large and easy-to-read LCD screen includes simultaneous temperature reading Replaceable Sensor (model SP-P2) Factory Calibrated: The PH-200 meter is three-point factory calibrated to 4, 7, and 10 pH. The meter can be recalibrated with digital calibration using the push buttons, rather than a screwdriver. Includes a cap, batteries, lanyard, and pH 7.0 bufferᅠ Specifications: pH Range: 0 - 14ᅠ Temperature Range: 0-80 ᄚC; 32-176 ᄚFᅠ Resolution: 0.01 pH; Temperature resolution is 0.1 ᄚC/Fᅠ Accuracy: +/- 0.02 pHᅠ Calibration: Digital automatic calibration (one point) with digital fine tuning Electrode: Replaceable glass sensor and reference tube electrodesᅠ Housing: IP-67 Waterproof (submersible; floats)ᅠ Power source: 3 x 1.5V button cell batteries (included)ᅠ Dimensions: 18.5 x 3.4 x 3.4 cm (7.3 x 1.3 x 1.3 inches)ᅠ Weight: 96.4 g (3.4 oz) ᅠ