4/20 SALE! GET UP TO 20% OFF STOREWIDE UNTIL 4/26!

Meters & Dosers

33 products


  • Sale -63% Measuring Cup, 1000 ml (1 liter) Hydrofarm

    Measuring Cup

    Sturdy, non-breakable food grade plastic cups with graduated metric markings and reinforced handle. Available in five convenient sizes.

    $3.28 - $9.79

  • Sale -31% HM Digital HydroMaster Portable/Wall Mount/Bench Continuous pH/EC/TDS/Temp HM Digital Meters

    HM Digital HydroMaster Portable/Wall Mount/Bench Continuous pH/EC/TDS/Temp

      HydroMaster Digital testers make monitoring water easier than ever by reading the levels that matter most and providing accurate readings that you can depend on. Continuous pH/EC/TDS/Temp monitor with rechargeable battery. Portable, wall mount, or benchtop use. HydroMaster HM-500 pH/EC/TDS/°F Tester (113831) Tests pH at a range of 0 pH-14 pH, temperatures from 30°F-176°F, TDS from 0-9999 ppm and EC from 0-9999 μS Stores up to 20 measurement readings, so you can monitor changes over time LCD touch-type screen with auto backlighting Powered by a rechargeable lithium ion battery Features an adjustable alarm that has a high and low set point Automatically turns off after 5 minutes Comes with wall mountable bracket, USB cable, 2 flotation disks, 1 EC/TDS conductivity sensor, 1 pH sensor, 1 packet each pH 4, pH 7, storage solution, and 1000 ppm calibration solution 110V-220V   Three year warranty (6 month warranty on the pH probe)

    $359.00$249.40

  • Sale -25% Metal Needle for 60CC Syringe Grodan

    Metal Needle for 60CC Syringe

    Used by the pros to take water samples deep inside a Grodan stonewool block or slab for better pH and EC analysis. Fits any standard Luer-Lock plastic syringe.

    $6.95$5.21

  • Sale -34% Active Air 2-Way Moisture/pH Meter Active Air

    Active Air 2-Way Moisture/pH Meter

    Gardeners can conveniently test moisture and pH levels with the handy Active Air 2-Way Meter. Moisture readings register on a scale of 0 (dry) to 10 (moist). pH readings between pH 3 (acidic) and pH 10 (basic) are represented. The durable, easy-to-read tester is suitable for indoors or out and needs no batteries to operate. Remove from soil and clean prongs after each use to ensure the moisture meter stays in top performance shape.

    $11.24$7.40

  • Sale -31% International Measuring Beaker Hydrofarm

    International Measuring Beaker

    Cross references all values for easy measuring. Sturdy, easily readable, large capacity & ergonomic. Ideal for home, lawn, garden or kitchen. Dishwasher safe, permanent markings, high visibility, with a heavy base to reduce tipping. Measures teaspoons, tablespoons, ounces, and milliliters.

    $17.32$12.00

  • Sale -21% HM Digital COM-80 EC/TDS/Temp Waterproof Hydro Tester HM Digital Meters

    HM Digital COM-80 EC/TDS/Temp Waterproof Hydro Tester

    The COM-80 is an economically priced, reliable EC/TDS meter that is ideal for testing applications such as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water and more.   Measures electrical conductivity (EC), total dissolved solids (TDS).  Excellent for hydroponic nutrient testing.   Four scales: EC: µS, mS;  TDS: ppm, ppt     Automatic Temperature Compensation (ATC)   Water resistant   Measurement Range: 0-9990 µS; 0-5000 ppm; 0-9.9 mS; 0-5.0 ppt    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—can be recalibrated with digital calibration using the push buttons   Includes a protective cap and batteries.       SPECIFICATIONS   EC Range: 0-9990 µS; 0-9.9 mS   TDS Range: 0-5000 ppm (mg/L); 0-5.0 ppt   Temperature Range: 1-80°C/33-176°F  Resolution: 1 µS/ppm; 0.1 mS/ppt   Temp. resolution: 0.1°C/F  Accuracy: +/- 2%  EC-to-TDS Conversion Factor: NaCl (avg of 0.5)  Calibration: Digital calibration by push button  Probe: Fixed  Housing: Water resistant Power source: 3 x 1.5V button cell batteries (included)  (model LR44 or equivalent) Dimensions: 15.3 x 3.2 x 1.8 cm (6.0 x 1.3 x 0.7 inches)  Weight: 53.9 g (1.9 oz)   1 year warranty

    $42.95$34.02

  • Sale -30% GroStar GS4 pH/EC/500ppm/700ppm/Temp (5-in-1) Combo Pen Hydroponic Center GroStar