The Apera TDS20 tests TDS and Temperature.

Model:                   TDS20
LCD Display:         Dual - TDS and Temperature
TDS Range:          0 to 100.0 ppm, 0 to 1000 ppm, 0 to 10.00 ppt
TDS Resolution:    00.1/1 ppm; 0.01 ppt
TDS Accuracy:      ± 1 % Full Scale
Temp Range:        0 to 50° C
Temp Accuracy:    ± 0.5 °C
Calibration:           1 to 2 point Auto