HM Digital Pen style TDS/EC/Temp meter

COM-80: EC/TDS HydroTester Series

The COM-80 is without a doubt the most advanced, low-cost, and dependable EC/TDS meter available. It is perfect for testing applications like drinking water, pools and spas, aquariums and reef tanks, hydroponics and gardening, and more because of its endurance and versatility.

Features
Measures electrical conductivity (EC), total dissolved solids (TDS). Excellent for nutrient testing
Four scales: EC: µS, mS; TDS: ppm, 0.5 (NaCl) & 0.7 (442™)
Automatic Temperature Compensation (ATC)
Water resistant
Digital Calibration (push button) to any point within the meter’s range
Auto-off function, data-hold function and low-battery indicator
Display: large and easy-to-read LCD screen includes simultaneous temperature reading.
Factory Calibrated: The COM-80 meter is calibrated with a 1413 µS solution.
Includes a protective cap and batteries
Specifications
EC Range: 0 to 9.9 mS; 0 to 9990 µS
Range of TDS: 0-5000 ppm (0.5 Scale); 0-8560 ppm (0.7 Scale)
Range of Temperature: 33-176 °F/ 1-80 °C
Resolution: 0.1 mS; 1 µS/ppm
Resolution of Temperature: 0.1 °C/F
+/- 2% is the accuracy.
Three 1.5V button cell batteries (LR44 or equivalent provided) serve as the power supply.
15.3 x 3.2 x 1.8 cm, or 6.0 x 1.3 x 0.7 inches, in dimensions
Weight: 1.9 oz or 53.9 g