Features:

• High accuracy pH, EC/TDS and temperature measurements
• Waterproof combo has a large easy-to-read, dual-level LCD and automatically shuts-off
• EC/TDS and pH readings automatically compensate for the effects of temperature (ATC)
• Tester has a greatly extended life:
• Replaceable pH electrode cartridge with an extendable cloth junction.
• EC/TDS graphite electrode resists contamination by salts/other substances.
• User can select the EC/TDS conversion factor and the temperature compensation coefficient (ß)

Specifications:

• Range:
• pH: 0.00 to 14.00 pH
• EC: 0 to 3999 µS/cm
• TDS: 0 to 2000 ppm
• Temp: 0.0 to 60.0°C / 32 to 140.0°F
• Resolution:
• pH: 0.01 pH
• EC: 1 µS/cm
• TDS: 1 ppm
• Temp: 0.1°C / 0.1°F
• Accuracy:
• pH: ±0.05 pH
• EC/TDS: ±2% F.S.
• Temp: ±0.5°C / ±1°F
• Temperature compensation: pH: automatic; EC/TDS: automatic with ß adjustable from 0.0 to 2.4% / °C
• Calibration:
• pH: automatic, 1 or 2 points with 2 sets of memorized buffers
• (pH 4.01 / 7.01 / 10.01 or 4.01 / 6.86 / 9.18)
• EC/TDS: automatic, 1 point
• TDS Conversion Factor: adjustable from 0.45 to 1.00
• pH Electrode: HI 73127 (replaceable; included)
• Environment: 0 to 50°C (32 to 122°F); RH max 100%
• Battery type / life: 4 x 1.5V / approx. 100 hrs of continuous use; auto-off after 8 min. of non-use
• Dimensions: 163 x 40 x 26 mm (6.4 x 1.6 x 1.0")
• Weight: 100 g (3.5 oz.)

Use the following formula to calculate the percentage of solids (TDS) that your membrane is removing: