Check the listing for details. HM Digital Hydroponics Pro Kit HPK-1. Condition: New. Listed at 169.99 USD. Waterproof Professional Series Meter KitThe HPK-1 is the hydro growers all in one solution. This kit combines the accurate COM-100 TDS (PPM)/EC/Temp meter and the reliable PH-200 pH/Temp meters together into one package.It also includes a zip closure protective case and a generous amount of calibration and storage solutions. This is the best value on the market for anyone looking to test as the Pro’s do. INCLUDES1x PH-200 Meter1x COM-100 Meter3x PH-4 Buffer3x PH-7 Buffer3x CP-1000 Solution3x PH-STOR Solution2x Lanyard3x Solution CupPRODUCT DESCRIPTIONCOM-100EC Range: 0 – 9990 µS; 0 – 9.99 mSTDS Range: 0 – 8560 ppm (0.7 Scale); 0 – 8.56 ppt (0.7 Scale)0 – 5000 ppm (0.5 Scale); 0-5.00 ppt (0.5 Scale)Temperature Range: 0-55 °C; 32-130°FResolution: 0-99: 0.1 µS/ppm/ 0.01mS/ppt; 100-999: 1 µS/ppm; 1000-9990: 10 µS/ppm. Temp. resolution is 0.1 °C/FAccuracy: +/- 2%EC to TDS Conversion Factor: Non-linear conversions for KCl, 442TM or NaCl solutions, selected by the user.Probe: Detachable platinum electrodesHousing: IP-67 Waterproof (submersible; floats)UPGRADED: Power source: 2 x Triple A (AAA) includedDimensions: 18.5 x 3.4 x 3.4 cm (7.3 x 1.3 x 1.3 inches)Weight: 127g (4.5 oz)442 is a registered trademark of the Myron L Company. PH-200pH Range: 0 – 14Temperature Range: 0-55 °C; 32-130 °FResolution: 0.01 pH; Temperature resolution is 0.1 °C/FAccuracy: +/- 0.1 pH; Temperature accuracy is +/-1%Minimum EC/TDS: 5 uS/10 ppmElectrode: Replaceable glass sensor and reference tube electrodesHousing: IP-67 Waterproof (submersible; floats)UPGRADED: Power source: 2 x Triple A (AAA) includedDimensions: 18.5 x 3.4 x 3.4 cm (7.3 x 1.3 x 1.3 inches)Weight: 96.4 g (3.4 oz)