HM Digital Waterproof Professional Series pH/EC/TDS/Temp Meter

COM-300L: Waterproof Professional Series pH/EC/TDS/Temp Meter
The COM-300L represents a high-quality pH/EC/TDS/Temp meter designed for comprehensive water quality analysis. It is perfect for hydroponics, water purification, wastewater management, aquaculture, colloidal silver production, scientific laboratories, pool maintenance, ecological studies, and industrial applications like boilers and cooling towers, as well as various water treatment processes.

Features: 
Measures temperature, salinity, total dissolved solids (TDS), electrical conductivity (EC), and potential hydrogen (pH).
Five scales: 0.7 (442™) scale, pH, µS, mS, ppm, and 0.5 (NaCl) scale
Three temperature coefficients are used in automatic temperature compensation (ATC).
Housing that is waterproof (IP-67 rated)
Digital Calibration (push button): Adjust the meter's range to any point.
Low battery indicator, data hold feature, and auto-off feature
The display is a sizable, readable LCD panel that shows the temperature simultaneously.
Changeable Sensor (SP-C3 model)
pH/EC/TDS factory calibrated
Comes with a translucent cap, two alkaline batteries (AAA), calibration solutions for pH 4 and 7, a pH storage solution, and a lanyard.

Specifications
Range of pH: 0 to 14 Range of EC: 0 to 9990 µS; 0 to 9.99 mS
Range of TDS: 0–8560 ppm (0.7 Scale); 0–5000 ppm (0.5 Scale)
Temperature Range: 32–130°F/0-55°C
Resolution: 0.1 µS/ppm/0.01mS for 0-99; 1 µS/ppm for 100-999; 10 µS/ppm for 1000-9990. Resolved temperature is 0.1 °C/F.
Accuracy: 2% EC to TDS +/- Ratio of Conversion: Non-linear conversions for the user's chosen KCl, 442TM, or NaCl solutions.
Probe: Glass pH sensor with reference tube electrodes and detachable platinum electrodes
IP-67 housing Waterproof (floating; submersible)
2 × Triple A (AAA) provided as a power source
18.5 x 3.4 x 3.4 cm, or 7.3 x 1.3 x 1.3 inches, in dimensions
Weight: 5.8 oz, or 164g