The HHWT-SD1 is a general purpose handheld instrument capable of measuring the pH, Oxidation-Reduction Potential (ORP) or conductivity of a solution, as well as its TDS (Total Dissolved Solids), DO (Dissolved Oxygen) or salt content. Using the included conductivity/TDS/salt probe, an optional DO probe, and optional ORP or pH electrodes the meter can measure pH from 0 to 14, ORP from -1999 mV to 1999 mV, conductivity up to 200 mS (milliSiemens), TDS up to 132,000 ppm, DO up to 20 mg/L, and salt content up to 12% by weight. The HHWT-SD1 is designed for water conditioning, wastewater monitoring, beverage production, aquaculture (fish farming), aquariums, pulp and paper processing, electroplating, and photography applications. A front-panel pushbutton enables rapid switching among the meter’s four measurement modes. Because it is microprocessor-based, the HHWT-SD1 is portable, reliable and has the large storage capacities that SD memory cards offer. Measurements can be made automatically at any sampling rate between one second and nine hours. After timestamping and storing the measurements on an SD card plugged into the meter, the user can remove the card and plug it into to a computer either directly or via a USB card reader. The values are stored on the card as files with the .xls extension, which can be opened by Microsoft’s Excel® application.
Specifications Display Size: 52 x 38 mm (2.05 x 1.5") Measurement Range: pH: 0 to 14 (probe sold separately) ORP: -1999 to 1999 mV (probe sold separately) Conductivity: Up to 200 mS (microSiemens) TDS: Up to 132,000 ppm DO: Up to 20 mg/L (probe sold separately) Salt: Up to 12% by weight Measurement Accuracy: pH: ±(0.02 pH units + 2 digits) (probe sold separately) ORP: ±(0.5% of reading + 2 digits) (probe sold separately) Conductivity: ±2% of full-scale reading + 1 digit TDS: ±2% of full-scale reading + 1 digit Temperature: ±0.8°C/±1.5°F DO: ±0.4 mg/L in solution (probe sold separately) Oxygen: 0.1% for oxygen in air (probe sold separately) Salt: ±0.5% of value Temperature Compensation: Automatic between 0 and 65°C (32 and 150°F) with optional ATC temperature probe. Manually settable between 0 and 100°C (32 and 212°F) without ATC probe Settable Parameters: Date, time, auto power off, beep sound, sampling time, decimal point or comma decimal division, temperature unit, compensation temperature. Also salt and altitude compensation (DO mode only) Operating Temperature: 0 to 50°C (32 to 122°F) Meter Dimensions: 135 H x 60 W x 33 mm D (5.31 x 2.36 x 1.30') Weight: 35 oz (2.19 lb)