HM Digital™ Aquapro TDS Water Tester Model AP-1
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Measures total dissolved solids (TDS) and temperature. Automatic Temperature Compensation (ATC). Water-resistant housing with digital calibration (push button). Measurement Range: 0-5000 ppm. Auto-off function, data-hold function and low-battery indicator. Includes a cap and batteries. Display: large and easy-to-read LCD screen includes simultaneous temperature reading. Factory Calibrated: The AquaPro is calibrated with a 342 ppm NaCl solution. The meter can be recalibrated with digital calibration using the push buttons, rather than a screwdriver.