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  • HM Digital HydroMaster HM-500

    HydroMaster Digital tester makes 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. 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. Includes 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.
    SKU:
    716147

    Retail: $359.00

    Special Price $273.00

  • Sure Test GroGuru Stem w/ 4 Sensors

    The sensors on the Sure Test® GroGuru Stem have been designed to provide you the info about your root zone to make your growing even more successful. These sensors measure the moisture content, Electrical Conductivity (EC), salinity and temperature of your medium. These lab rated sensors are highly accurate, very reliable and have passed SWAT certification conducted by Irrigation Association. The Stem communicates wirelessly with a Base unit called the Collector which can be up to 1000 feet away (batteries not included). The Stems report measurements from each of the sensors once every 30 minutes. This information is then reported to software on your desktop and/or smartphone app.
    SKU:
    716408

    Retail: $599.00

    Special Price $479.20

  • Luster Leaf Rapitest Water Check, 3 Pack

    Water Check instantly tells when plants need watering; stick will darken when plant has proper moisture and lighten when plants need more water. Includes 3 sticks.
    SKU:
    WC803
    $2.99
  • Hanna pH 7.01 Calibration Solution 20 ml

    Hanna® packet solutions are prepared according to precise formulas and are standardized with a pH meter calibrated according to the NIST standards. The 20 ml sachets are single-dose and are ready to use.
    SKU:
    716876
    $1.32
  • Hanna Storage Solution Pint_DUPLICATE_USE_SKU_HI70300L

    To minimize clogging and ensure fast response time, always keep the glass bulb and the junction of your pH electrode moist. Store the electrode with a few drops of HI 70300 storage or pH 7.01 buffer solution in the protective cap.
    SKU:
    716468

    Retail: $18.95

    Special Price $15.16

  • HM Digital Replacement Probe for pH

    Measures pH and Temperature. Auto-ranging three point calibration with digital fine tuning. pH buffer 4 solution is in a sponge embedded in a clear cap. Measurement Range: 0-14 pH with a waterproof housing. Digital automatic calibration (one point), with digital fine tuning. Auto-off, data-hold functions and low-battery indicator. Display: large and easy-to-read LCD screen includes simultaneous temperature reading. Factory calibrated with three-point calibration to 4, 7, and 10 pH. The meter can be recalibrated with digital calibration using the push buttons, no screwdriver needed. Includes a cap, batteries, lanyard and pH 7.0 buffer.
    SKU:
    716180

    Retail: $45.95

    Special Price $36.76

  • Nutradip Grow Boss TDS Replacement Probe (SPECIAL ORDER ITEM - 2-4 WEEK LEAD TIME)

    The GrowBoss Nutrient probe does double duty. This probe measures TDS while auto sensing temperature when immersed in your nutrient solution, sending this data to the GrowBoss indicator. The GrowBoss Nutrient/Temperature probe has a 6 foot cord and connects easily to the GrowBoss indicator via a USB style connector. These probes are built tough and will last for many years.
    SKU:
    716368

    Retail: $62.95

    Special Price $50.36

  • Luster Leaf Rapitest Moisture Meter

    Ideal for indoor use, the Rapitest® Moisture Meter instantly indicates when plants need watering. This meter takes readings at the root level for the most accurate results. Includes moisture level recommendations for over 150 garden plants. No batteries required.
    SKU:
    RMM800
    $14.99
  • Luster Leaf Rapitest Soil Tester

    The Rapitest Soil Tester comes complete with five individual testing vials: two each for pH and one each for nitrogen, phosphorus and potash. Test results are compared to the included printed color chart.
    SKU:
    RTS800
    $5.99
  • Essentials Calibration 8oz 7.0

    For the calibration of pH testers. Use in conjunction with pH Buffer 4.
    SKU:
    ESCAL87

    Retail: $7.95

    Special Price $7.55

  • Essentials pH Up Qt case of 12

    Easy control 15% strength water stabilizer. Increases pH of nutrient solution.
    SKU:
    ESPHUQT

    Retail: $129.95

    Special Price $84.46

  • Essentials Calibration Qt 7.0

    For the calibration of pH testers. Use in conjunction with pH Buffer 4.
    SKU:
    ESCALQT7

    Retail: $19.95

    Special Price $18.95

  • Hanna SPO EC/TDS Probe for HI981409 & HI981410

    EC/TDS Probe for HI981409 & HI981410 with DIN connector measures 24 cm (9.4) and can be used to mix the fertilizer solution. The meter switches off after five minutes of inactivity to save battery life. The outer casing also incorporates a molded eye so that the meter can be hung right where it is needed.Calibration with this meter is easy and completely automatic. Simply press and hold the on/off button for a few seconds and the meter will request the appropriate calibration solution. Place the probe in the solution and wait until it is calibrated. No extra buttons to push or dials to turn!The tester has been specifically designed to address the needs of operators in hydroponics greenhouses and nurseries.FeaturesLightweight -- it floatsWater resistantIdeal for mixing fertilizerAutomatic calibrationAutomatic temperature compensation"
    SKU:
    HI1220

    Retail: $85.99

    Special Price $64.49

  • Commercial Grade Combo pH/EC/TDS/Temp Meter (SPECIAL ORDER - 3-4 WEEKS LEAD TIME / MUST PREPAY)

    Multi-range pH/EC/TDS and Temperature meter - 4-in-1 pH/EC/TDS/Temperature probe - The rugged MA851D/1 probe has been designed for heavy-duty applications (agriculture industrial etc.)RANGE:0.00 - 14.00 pH 0 - 3999 µS/cm 0 - 1999 ppm 0.0 - 60.0°C 32.0 - 140.0°FRESOLUTION:0.01 pH 1 µS/cm 1 ppm 0.1°C 0.1°FACCURACY± 0.01 pH ± 2% Full scale (for EC and TDS) ± 0.5°C ± 1°FTEMPERATURE COMPENSATION: Automatic from 0 to 60°C/from 32 to 140°FpH CALIBRATIONIn 1 or 2 points with automatic buffer recognitionEC CALIBRATIONAutomatic in 1 pointEC/TDS CONVERSION FACTORAdjustable from 0.45 to 1.00;
    SKU:
    MI805

    Retail: $551.99

    Special Price $429.95

  • Hanna Replacement probe for HI9026 (SPO item takes 3-4 weeks to get)

    This replacement probe supports the combination pH electrode for field applications.The HI 9026 is an advanced pH/ORP meter specifically designed to provide affordable and very precise results under harsh industrial conditions. The meter features a backlit display for clear readings in the darkest environments.When calibration is complete the electrode condition is displayed which indicates that the electrode is working properly and when it needs to be cleaned or replaced.
    SKU:
    HI1230B

    Retail: $135.99

    Special Price $101.99

  • PH/ORP Storage Solution

    For use with HM Digital's PH-200 and ORP-200. Always make sure your sensor is kept in an electrode storage solution.
    SKU:
    HMOPSTOR

    Retail: $6.95

    Special Price $6.60

  • Botanicare PH Down 1 Gallon

    With plants, nutrient availability can be affected by soil or solution pH. pH levels outside recommended ranges can lead to nutrient lockout and nutrient deficiencies resulting in stunted growth and poor appearance. Control pH levels, minimize problems and maximize your plants full potential with Botanicares pH Up and pH Down solutions. Botanicares pH Down consists of a 29 percent concentrated Phosphoric Acid solution that rapidly lowers pH levels with its gentle, non-burning formula.
    SKU:
    722195

    Retail: $27.95

    Special Price $23.00

  • Essentials Calibration Qt 4.01

    For the calibration of pH testers. Use in conjunction with pH Buffer 7.
    SKU:
    ESCALQT4

    Retail: $19.95

    Special Price $18.95

  • Essentials pH Down Qt case of 12

    Easy control 15% strength water stabilizer. Decreases pH of nutrient solution. ;
    SKU:
    ESPHDQT

    Retail: $129.95

    Special Price $84.46

  • Essentials pH Up Gal case of 4

    Easy control 15% strength water stabilizer. Increases pH of nutrient solution.
    SKU:
    ESPHUGAL

    Retail: $117.19

    Special Price $71.47

  • TWO METERS - Bluelab pH Pen & Bluelab PPM Pen

    The Bluelab pH Pen is the latest innovation for hand held pH meters and is the ultimate handy solution for measuring pH. Hydroponic growing lets you give the best care possible to your plants. The quality of care is in your control. The Bluelab pH Pen provides a compact, quick and handy way to manage the success of your crops to ensure maximum uptake of nutrients. Teamed with our Bluelab EC Pen or Bluelab ppm Pen, you have a handy, convenient and accurate system for ensuring optimum plant growth and health. The Bluelab pH Pen and conductivity pen range has been specially developed as an affordable and effective option for hobby or small scale growers. Features: Measures pH and temperature Selectable units for ˚C & ˚F Backlit LCD display Double junction probe (not replaceable) Successful calibration indicator Hold function Low battery warning Fully waterproof Auto off function Automatic temperature compensation The Bluelab conductivity pens are the latest innovation for hand held conductivity meters and the ultimate handy solution for measuring conductivity. Hydroponic growing lets you give the best care possible to your plants. The quality of care is in your control. The Bluelab Conductivity Pens measure how much food the plant has available. The Bluelab ppm pen provides a compact, quick and handy way to manage the success of your crops to ensure they have the nutrients they need. Teamed with Bluelab's pH Pen, you have a handy, convenient and accurate system for ensuring optimum plant growth and health. The Bluelab pH Pen and conductivity Pen range has been specially developed as an affordable and effective option for hobby or small scale growers. Features: Measures conductivity and temperature Selectable units for conductivity and temperature Backlit LCD display Calibration optional Successful calibration indicator Hold function Low battery warning Fully waterproof Auto off function Automatic temperature compensation
    SKU:
    BLU2221PHnPPMPENS

    Retail: $199.00

    Special Price $145.00

  • Bluelab pH Probe KCl Storage Solution 100 ML

    The Bluelab Calibration Solutions are a very necessary part of a growers toolbox. These solutions are manufactured specific to the calibration process and referenced to high laboratory standards by Bluelab. They are required for the calibration of pH meters, pH monitors and controllers. Regular cleaning and calibrating of pH measuring equipment ensures accurate readings. Bluelab's EC/CF equipment does not need calibrating, as they are all factory calibrated at Bluelab. The CF27.7 solution is used as a reference to ensure you have adequately cleaned the EC/CF probe.

    SKU:
    BLU1008
    $11.95
  • Botanicare PH Up Gallon (DISCONTINUED - EXISTING STOCK ONLY)

    With plants, nutrient availability can be affected by soil or solution pH. pH levels outside recommended ranges can lead to nutrient lockout and nutrient deficiencies resulting in stunted growth and poor appearance. Control pH levels, minimize problems and maximize your plants full potential with Botanicares pH Up and pH Down solutions. Botanicares pH Up consists of a 29% concentrated Potassium Hydroxide solution that has an extremely low level of phytotoxicity and does not contain salts or chlorides.
    SKU:
    722185

    Retail: $27.95

    Special Price $23.00

  • Botanicare PH Up 1 Quart *S*

    With plants, nutrient availability can be affected by soil or solution pH. pH levels outside recommended ranges can lead to nutrient lockout and nutrient deficiencies resulting in stunted growth and poor appearance. Control pH levels, minimize problems and maximize your plants full potential with Botanicares pH Up and pH Down solutions. Botanicares pH Up consists of a 29% concentrated Potassium Hydroxide solution that has an extremely low level of phytotoxicity and does not contain salts or chlorides.
    SKU:
    722180

    Retail: $11.95

    Special Price $11.35

  • Botanicare PH Down 1 Quart *S*

    With plants, nutrient availability can be affected by soil or solution pH. pH levels outside recommended ranges can lead to nutrient lockout and nutrient deficiencies resulting in stunted growth and poor appearance. Control pH levels, minimize problems and maximize your plants full potential with Botanicares pH Up and pH Down solutions. Botanicares pH Down consists of a 29 percent concentrated Phosphoric Acid solution that rapidly lowers pH levels with its gentle, non-burning formula.
    SKU:
    722190

    Retail: $11.95

    Special Price $11.35

  • SOIL Stake PH Pen - Bluelab Soil pH Pen

    Bluelab soil pH Pen - get your hands on Bluelab's newest hand held meter.

    This clever Soil pH Pen will help you manage the success of soil grown crops. The Soil pH Pen provides a pH and temperature reading of soils and media, so you know the right nutrients will be made available to your plants. It will measure solutions also...

    SKU:
    BLU2216

    Retail: $185.00

    Special Price $139.25

  • Oakton Calibration Solution 15000 uS case of 20

    Oakton Calibration Solution 15000
    SKU:
    OK3565313

    Retail: $52.99

    Special Price $39.74