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  • 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.

    Retail: $1.32

    Special Price $1.06

  • Hanna Storage Solution Pint

    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.

    Retail: $18.95

    Special Price $15.16

  • 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.

    Retail: $359.00

    Special Price $260.00

  • 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.

    Retail: $62.95

    Special Price $50.36

  • 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.

    Retail: $45.95

    Special Price $36.76

  • PH/Temperature Meter

    pH/temperature meter.

    Retail: $62.95

    Special Price $47.10

  • 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.

    Retail: $106.95

    Special Price $95.00

  • Commercial Grade Combo pH/EC/TDS/Temp Meter

    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;

    Retail: $429.95

    Special Price $338.37

  • 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"

    Retail: $69.95

    Special Price $60.00

  • TDS/Conductivity/Salinity Pocket Pen

    This instrument is designed to be extremely accurate fast and simple to use in diverse water quality applications. Advanced features include the ability to select from 3 different solution types that model the characteristics of the most commonly encountered types of water; proprietary temperature compensation and TDS conversion algorithms; highly stable microprocessor-based circuitry; user-intuitive design; and waterproof housing. A true one-handed instrument the PT1 is easy to calibrate and easy to use. To take a measurement you simply press a button then dip the pen in solution. Results display in seconds.; Accuracy of ±1% of READING ±.2% at calibration point; Reliable Repeatable Results; Automatic temperature compensation; Autoranging; Accuracy of benchtop lab equipment in an affordable portable compact pen; Rugged reliable shock-resistant fully encapsulated electronics body constructed of aircraft;; ; aluminum; Simple one button function; Specially designed with measurement ranges and solution modes to meet the water quality ;; testing needs of many applications; High capacity N-type battery included; Waterproof;

    Retail: $209.95

    Special Price $155.57

  • 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.

    Retail: $6.95

    Special Price $6.60

  • Essentials Calibration 8oz 4.01

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

    Retail: $12.11

    Special Price $7.55

  • 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...


    Retail: $185.00

    Special Price $133.20

  • Essentials pH Down Gal case of 4

    Easy control 15% strength water stabilizer. Decreases pH of nutrient solution.

    Retail: $117.19

    Special Price $71.47

  • Essentials pH Test Kit

    (Wide Spectrum) Measures 3-10 pH.The Hydroponic Essentials pH test kit is good for 150 tests. At the rate of 3 tests per week it will last one year making it excellent value for money. This kit covers a pH range of 3-10 measuring in 0.1 increments.

    Retail: $9.90

    Special Price $5.65

  • Hanna GroChek EC Electrode

    Hanna replacement EC electrode for pocket testers.

    Retail: $57.95

    Special Price $43.34

  • Hanna 1500 ppm TDS Calibration Solution 16 oz

    Hanna Instruments' calibration solution ideal for gardening laboratory work and field experiments comes in packaging designed to keep air and light from damaging the solution.

    Retail: $18.99

    Special Price $13.50

  • Essentials Calibration Qt 7.0

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

    Retail: $19.95

    Special Price $18.95

  • Essentials pH Up Qt case of 12

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

    Retail: $129.96

    Special Price $84.46

  • Oakton WP TDS Tester 11

    Test nutrient concentration and check temperature with one testr. All the features of the TDS/ECTestrs and more. Analyze hydroponic solutions using either cup-style or dip-style measurements with a single instrument. Cup-style is ideal for small volumes samples from valves or when impractical to use dip-style sensors.

    Retail: $119.95

    Special Price $87.32

  • Oakton Calibration Solution 15000 uS case of 20

    Oakton Calibration Solution 15000

    Retail: $46.00

    Special Price $34.38

  • Nutrilife H2O2 29% Quart - Case of 12 (Can't Be shipped)

    A 29% liquid concentrate solution that adds oxygen to nutrient solutions through chemical compounds. This additive is excellent for cleaning hydroponic equipment materials and growing areas. ;

    Retail: $147.00

    Special Price $139.02

  • EC/TDS/Temp Waterproof Hydro Tester

    ;; KEY FEATURESBest value in its class (under $50)Measures;electrical conductivity;(EC) TDS and temperature.Automatic Temperature Compensation (ATC)Water-resistant housingLarge LCD displayHold button and Auto shut-offDigital Calibration (push button) Low battery indicatorVery reliable and long lasting;SPECIFICATIONSRange: 0-9999 µS / 0-5000PPMTemperature Range: 0-80 °C; 32-176 °FResolution: 1 μS/ ppm; Temp. resolution is 0.1 °C/FAccurate to +/- 2%Power source:;1 x 3V button cell (included) (model 357A / LR44)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);

    Retail: $47.95

    Special Price $37.69

  • Hanna WM pH TDS Cntrl. 15 VAC

    Add this 2-in-1 pH and TDS controller engineered for economical dosage of fertilizer solutions in hydroponics to your growroom.The product;measures pH from 0 to 14 and TDS from 0 to 1999 mg/L (ppm). Two separate set points can be adjusted from 4 to 7 pH and 900 to 1800 ppm (mg/L). The relays are activated when the pH exceeds the set point or TDS falls below the desired value. Two pumps or electrovalves can be wired directly to the controller and be powered through the terminals. Independent proportional settings for pH and TDS can be adjusted from 0 to 90 seconds 0 to 2.0 for pH and 0 to 400 mg/L (ppm) for TDS. A matching pin/ground probe can be connected to the appropriate terminals to extend electrode life and eliminate interference.Included is;an alarm relay which is activated in several circumstances such as when the pH is below the set points in the operator-adjustable threshold of 0.5 to 2.5 pH or similarly TDS exceeds the set point by a value in the 50 to 450 mg/L (ppm) range. The alarm also goes off if the pH and/or TDS are not corrected within the operator-determined time frame of 1 to 10 minutes. Moreover the alarm configuration is switchable from a normally-closed to a normally-open state or turned off during maintenance. The fertilization status can be ascertained from a distance through dosage and alarm LEDs.Use this product with;pH electrodes with a BNC connector and TDS probes with a DIN connector.

    Retail: $777.95

    Special Price $595.00

  • Hanna Mini pH Controller

    The mini pH controller has been designed for easy affordable installation in tight spaces ideal for simple and effective process control. The unit is provided with high impedance pH input and can be used with any pH electrode with standard BNC connector. Measurements are clearly displayed on the LCD while the status LED indicates operating mode.The controller also features a dosing relay. Acid dosing causes the relay to activate when the measurement is higher than the set point. If the basic dosing is selected the relay is activated when the reading falls below the set point.Set point adjustment (from 0 to 14 pH) and calibration procedures are easily performed with trimmers on the front panel. Users can choose from automatic or manual dosing modes with a switch on the front panel. Manual control is particularly useful during maintenance operations because it permits operators to enable or disable the dosing relay according to need. An overtime control system advises users when the relay is active too long to help prevent overdosing.Simple to operate pH controller User-selectable acid or alkaline relay Use where space and cost are major concerns Applications include hydroponics swimming pools fertilizers Easy to handleFire-retardant casingSelectable overdose protection systemSplash resistant coverIncludes mounting brackets transparent cover and instruction manual;

    Retail: $213.95

    Special Price $154.04

  • Hanna GroChek EC Tester

    This EC tester has been specifically designed to address the needs of operators in hydroponics greenhouses and nurseries.Calibration 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 probe measures 24 cm (9.4) and can be used to mix 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.Ideal for hydroponics and greenhousesWaterproof housing floats for quick retrievalAuto switch-off for longer battery lifeFertilizer mixer (long and rugged probe)Lightweight -- it floatsWater resistantIdeal for mixing fertilizerAutomatic temperature compensation"

    Retail: $115.95

    Special Price $84.41

  • Hanna Conductivity/TDS Probe for Soil Measurement of HI993310

    Stainless steel conductivity probe with internal temperature sensor DIN connector and 1 m (3.3') cable for direct soil measurement.For use with HI993310 only.;

    Retail: $156.95

    Special Price $113.00

  • Hanna Electrolyte Solution (SPECIAL ORDER ITEM - 2-3 WEEKS LEAD TIME)

    Check your refillable electrolyte level before performing any measurements. If the level is low refill with the proper electrolyte solution to ensure the correct electrode performance. This simple maintenance helps guarantee the efficiency and precision of your refillable electrodes.These electrolyte solutions are also available in FDA-compliant bottles.;

    Retail: $78.99

    Special Price $71.09

  • Hanna 12880 S/ cm conductivity solution

    This Hanna conductivity calibration solution is widely used to assure the proper performance of conductivity meters with a scale higher than 10 This solution is used mainly for industrial applications and is available in various sizes to better meet your specific application requirements.

    Retail: $23.30

    Special Price $12.30

  • Hanna pH Combo Electrode Glass Body

    pH Combo Electrode Glass Body - Refillable Temp.

    Retail: $192.95

    Special Price $138.92