HM Digital TDS-4 Pocket Meter.
Range: 0 - 9990 ppm (mg/L)
Resolution: 0-999: 1 ppm; 1000-9990 10 ppm (indicated by a 'x10' icon)
Accuracy: +/- 2%
EC-to-TDS Conversion Factor: NaCl (avg. 0.5)
ATC: Built-in sensor for Automatic Temperature Compensation of 1 to 50 degrees Celsius (33 to
122 degrees Farenheit)
Replaces: WP-2000 TGI-SPRITE TDS POCKET METER