Ideal for all water quality testing, water purification applications, wastewater regulation, aquaculture, hydroponics, colloidal silver, labs & scientific testing, pools & spas, ecology testing, boilers & cooling towers, water treatment and more.  The COM-100 is a professional level EC/TDS meter at an unbeatable price.  The continuous improvement process at HM Digital yielded certain product design changes beginning in late 2015.  Buckeye Hydro carries only COM-100 meters of the most current design.  

FEATURES

• Measures electrical conductivity (EC), total dissolved solids (TDS), and temperature.
• Four scales: EC measurements available in µS (microsiemens) or mS (millisiemens).  TDS measurments available in ppm (parts per million = mg/L) or ppt (parts per thousand).
• Two non-linear, user-selectable EC-to-TDS conversion factors (442^TM, NaCl).
• Automatic Temperature Compensation (ATC) 
• Waterproof housing (IP-67 rating)
• TDS Measurement Range: 0-8560 ppm (442 scale); 0-5000 ppm (NaCl scale)
• 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.
• Replaceable Sensor (model SP-C1)
• Factory Calibrated: The COM-100 meter is calibrated with a 1413 µS solution. The meter can be recalibrated with digital calibration using the push buttons, rather than a screwdriver.
• Includes a cap, batteries and lanyard.

SPECIFICATIONS

EC Range: 0 - 9990 µS; 0 - 9.99 mS
TDS Range: 0 - 8560 ppm (mg/L); 0 - 8.56 ppt
Temperature Range: 0-55 °C; 32-130 °F
EC Resolution: 0-99: 0.1 µS; 100-999: 1 µS; 1000-9990: 10 µS
TDS Resolution:  0-99: 0.1 ppm; 100-999: 1 ppm; 1000-9999: 10 ppm
Temperature Resolution: 0.1 °C/F 
Accuracy: +/- 2%
EC to TDS Conversion Factor: Non-linear conversions for 442^TM or NaCl solutions, selected by the user. 
Calibration: Digital calibration by push button.
Probe: Detachable platinum electrodes
Housing: IP-67 Waterproof (submersible).  The COM-100 floats.
Power source: Two 1.5V AAA batteries (included).
Dimensions: 7.3 x 1.3 x 1.3 inches
Weight: 4.5 oz

NOTES

Conductivity: 1 mho = 1 Siemen
Normal unit of measurement is:
1 micromho (µmho) = 1 microSiemen (µS),
1 millimho (mmho) = 1 milliSiemens (mS) = 1,000 µS