HM Digital Pro Series Pen style pH/TDS/EC/Temp meter

COM-300: Professional Series Waterproof pH/EC/TDS/Temp 
Meter Professional grade pH/EC/TDS/Temp meter COM-300 is perfect for hydroponics, water purification, wastewater management, aquaculture, lab and scientific testing, pools and spas, ecology testing, boilers and cooling towers, water treatment, and more.
Features: Temperature, Electrical Conductivity (EC), Total Dissolved Solids (TDS), Potential Hydrogen (pH), and
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
contains two (AAA) alkaline batteries, a translucent cap, and a pH contains two (AAA) alkaline batteries, a translucent cap, and a pH
pH storage solution, lanyard, and calibration solutions 4 and 7 Details
Range of pH: 0 to 14 pH EC Ranges from 0 to 9990 µS and 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
Result:
pH: 0.1 EC 0.01 mS for 0–999; µS for 1000–9990; and µS for 0–9.99 mS
TDS: 1 ppm for 999–999 / 10 ppm for 1000–9990
Atmosphere 0.1 °C/°F
Precision: ± 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
101.5g (3.6 oz) in weight