The Sunleaves TDS Expert Plus is a highly-advanced handheld meter that measures nutrient solution electrical conductivity (EC), total dissolved solids (TDS), and liquid temperatures. 

This waterproof EC / TDS / TEMP combination meter features an easy-to-read LCD screen, five-minute auto-off, data-hold functions and low-battery indicator. Expect battery life of about 100 hours of usage. The TDS Expert Plus meter even has Automatic Temperature Compensation (ATC) to ensure accurate readings.

There are three different conversion factors to convert EC to TDS, using the KCl, 442TM and NaCl scales. Although it comes factory calibrated at 1413 micro-seimens (µS), the TDS Expert Plus has a push-button digital adjustment for easy, precise calibration.

Specifications:

EC Range: 0 - 9990 µS
TDS Range: 0 - 8560 ppm (mg/L)
Temperature Range: 0-80 °C; 32-176 °F
Accuracy: +/- 2% F.S.
Power source: 3 x 1.5V button cell batteries (included)
Dimensions: 7.3" x 1.3" x 1.3"
Weight: 3.2 oz without case

The Sunleaves TDS Expert Plus meter includes a lanyard, batteries and one-year warranty. Replacement probe also has platinum electrodes, same as the original equipment.