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  • Replacement Probe for MW801 & MW802 ONLY

    Combination Probe For pH/EC/TDS with 1 meter cable 

    ** FOR NEW STYLE MW801 / MW802 UNITS ONLY

    SKU:
    MISE600

    Retail: $99.95

    Special Price $72.76

  • Oakton pHTestr 10 - .1 pH Accuracy ATC*

    *ATC-Automatic Temperature Compensation.

    Optimize nutrient strength during growth, flowering, and fruitingReliable waterproof, dustproof housing and replaceable electrode provide long life and value.Auto shutoff conserves battery life.
    Oakton pH Testers 10, 20, & 30feature large display screens

    Replacement sensors:
    OK-35624-09for pHTestr 1
    OK-35624-29for pHTestr 2
    OK-35653-01 pH 4.0 calibration solution
    SKU:
    OK3563410

    Retail: $136.95

    Special Price $98.60

  • Oakton pHTestrs replacement sensor

    replacement sensor for oakton's line of 10, 20, and 30 series pHtestrs (OK3563410, OK3563420, and OK3563430).
    SKU:
    OK3562438

    Retail: $99.95

    Special Price $72.76

  • Oakton Replaceable Electrodes pH WP 2 Pen

    THIS IS FOR A REPLACEMENT ELECTRODE not an entire unit
    Optimize nutrient strength during growth, flowering, and fruitingReliable waterproof, dustproof housing and replaceable electrode provide long life and value.

    Replacement sensors:
    OK-35624-09for pHTestr 1
    OK-35624-29for pHTestr 2
    OK-35653-01 pH 4.0 calibration solution
    SKU:
    OK3562429

    Retail: $78.95

    Special Price $59.97

  • Eco Tester TDS High

    New economical conductivity and TDS pocket meters feature a large, ergonomically designed display so that you can easily view measurements at a glance. The orientation of the display means there's no need to turn your head or tilt the tester. Waterproof and dustproof housing is designed for use in dirty and damp field conditions. Convenient, built-in belt/pocket clip keeps the tester accessible when not in use.

    Stainless steel electrodes are both rugged and chemical resistant, for use in a wide variety of applications. Single-point electronic calibration means you are ready to measure quickly and easily. Additional features include auto-shutoff to prolong battery life, hold function to lock in a measured value, and self-diagnostic error messages. Testers also have a self-adjusting TDS factor from 0.40 to 1.0.

     

    SKU:
    OK3546215

    Retail: $85.95

    Special Price $61.84

  • Eco Tester TDS Low

    New economical conductivity and TDS pocket meters feature a large, ergonomically designed display so that you can easily view measurements at a glance. The orientation of the display means there's no need to turn your head or tilt the tester. Waterproof and dustproof housing is designed for use in dirty and damp field conditions. Convenient, built-in belt/pocket clip keeps the tester accessible when not in use.

    Stainless steel electrodes are both rugged and chemical resistant, for use in a wide variety of applications. Single-point electronic calibration means you are ready to measure quickly and easily. Additional features include auto-shutoff to prolong battery life, hold function to lock in a measured value, and self-diagnostic error messages. Testers also have a self-adjusting TDS factor from 0.40 to 1.0.

     

    SKU:
    OK3546210

    Retail: $84.95

    Special Price $61.84

  • Replacement Sensor

    Replacement sensor for Oakton Waterproof Multiparameter TestrTM 35-series Pocket Meters (OK3542500 and OK3542505).

    SKU:
    OK3542550

    Retail: $112.95

    Special Price $80.77

  • Waterproof PT Testr 35 (pH & TDS)

    Two important measurements in one instrument. The PCTestr tests conductivity and pH while the PTTestr tests TDS and pH. They feature easy-to-read displays, push-button calibration, HOLD function, and error messages. Valox® housing and stainless steel electrodes offer good chemical compatibility and durability, and are designed to float,. All waterproof Testrs have replaceable sensors.

    SKU:
    OK3542505

    Retail: $192.95

    Special Price $136.76

  • Waterproof PC Testr 35 (EC & pH)

    Two important measurements in one instrument. The PCTestr tests conductivity and pH while the PTTestr tests EC and pH. They feature easy-to-read displays, push-button calibration, HOLD function, and error messages. Valox® housing and stainless steel electrodes offer good chemical compatibility and durability, and are designed to float,. All waterproof Testrs have replaceable sensors.

    SKU:
    OK3542500

    Retail: $192.95

    Special Price $138.92

  • Waterproof EcoTestr pH1

    Ideal for Student, Hydroponics, and Hobbyist use!
    Economical, pocket sized meter is perfect for less demanding applications
    Waterproof, dustproof housings float
    Easy to use; push-button calibration with auto buffer recognition
    Includes transparent electrode cover / sample cup
    Push-button calibration, HOLD function, and error messages

    OAKTON's new EcoTestr is economical and easy to use. With its crystal clear, ergonomically designed display, you can easily view measurements at a glance.
    Each rugged tester has waterproof and dustproof housing for use in dirty and damp field conditions. Simply dip and read-the orientation of the display means there's no need to turn your head or tilt the tester
    Single-junction electrode is well-suited for general purpose applications. Recessed bulb with bulb guard protects against breakage
    One point calibration with auto-buffer recognition for quick calibrations. Hold function locks in measured value. Auto-off function preserves batteries.

    Specifications
    Range: 0.0 to 14.0 pH
    Resolution: 0.1 pH
    Accuracy: 0.1 pH
    Temperature compensation: none, bring samples and standards to
    room temperature
    Calibration: one point
    Buffer recognition: 4.0, 7.0, or 10.0
    Display: three-digit vertical LCD
    Power: four 1.5 V button cell batteries (included)
    Battery life: >300 hours

    SKU:
    OK35423-00

    Retail: $71.95

    Special Price $53.07

  • Probe pH Electrode

    SKU:
    ND1100053

    Retail: $65.95

    Special Price $49.33

  • Milwaukee TDS/PPT T76 Tester WP

    Milwaukee TDS T76 Tester WP - measures in PPT

    SKU:
    MIT76

    Retail: $85.95

    Special Price $62.57

  • Milwaukee TDS/PPM T75 Tester WP

    Stainless steel probes deliver fast and accurate readings with ten times better resolution. Comes with protective case and calibration solution.

     

    Measures in part per million (PPM)

    SKU:
    MIT75

    Retail: $85.95

    Special Price $62.57

  • EC65 Waterproof Tester

    The C65 is a microprocessor based Conductivity Tester with a rugged one-piece IP67 waterproof casing. Immersible up to the LCD! This instrument is a low cost and easy to use Meter with a replaceable electrode.

    Some of the C64's features include:
    • Automatic Temperature Compensation
    • IP67 Waterproof Casing
    • Replaceable Electrode
    • Easy to Read LCD
    • Easy to Use
    Range 0 - 1999 S/cm
    Resolution-1 S/cm
    Accuracy - 2% full scale
    Calibration - Manual 1 point
    Electrode - Replaceable MA73075Temp.
    Compensation - Automatic 0 - 50C
    Battery Life - 250 hours of continuous useBattery Type 3 x 1.5V
    Environment 0 - 50C / 100% RH
    SKU:
    MIC65

    Retail: $80.95

    Special Price $58.93

  • Oakton pHTestr 20 - .01 pH Accuracy *ATC (Invalid SKU)

    *ATC-Automatic Temperature Compensation

    Optimize nutrient strength during growth, flowering, and fruitingReliable waterproof, dustproof housing and replaceable electrode provide long life and value.Auto shutoff conserves battery life.
    Oakton pH Testers 10, 20, & 30feature large display screens

    Replacement sensors:
    OK-35624-09for pHTestr 1
    OK-35624-29for pHTestr 2
    OK-35653-01 pH 4.0 calibration solution
    SKU:
    OK3563420

    Retail: $154.95

    Special Price $108.68

  • pHTestr 30 - .01 pH Accuracy Temperature Display

    *ATC-Automatic Temperature Compensation

    Optimize nutrient strength during growth, flowering, and fruitingReliable waterproof, dustproof housing and replaceable electrode provide long life and value.Auto shutoff conserves battery life.
    Oakton pH Testers 10, 20, & 30feature large display screens

    Replacement sensors:
    OK-35624-09for pHTestr 1
    OK-35624-29for pHTestr 2
    OK-35653-01 pH 4.0 calibration solution
    SKU:
    OK3563430

    Retail: $164.95

    Special Price $118.76

  • Oakton Low/High/EC High Replacement Sensor

    This is a replacement part, not an entire unit!
    Optimize nutrient strength during growth, flowering, and fruitingSame reliable waterproof dustproof housing as pHTestr.
    Choose from models for TDS or conductivity (ECTestr); 1% accuracy.

    Replacement sensors and solutions
    OK-35661-17for TDSTestr Low, High, ECTestr High
    OK-35653-13 15 mS calibration solution for High Testrs
    SKU:
    OK3566117

    Retail: $79.95

    Special Price $58.20

  • Milwaukee Instruments pH 600 pH Tester With 1 Point Manual Calibration

    Milwaukee's economical tester is an easy-to-use, low cost instruments to measure quick and reliable pH, EC or TDS values. 

    Measuring electrical conductivity is the best way of checking the amount of salt or dissolved solids (TDS) in water. Milwaukee provides you with a range of pocket testers that will allow you to measure from very low to very high conductivity solutions. All EC/TDS testers compensate for the temperature variance automatically.

    • Range: 0.0 to 14.0 pH
    • Resolution: 0.1 pH
    • Accuracy: +/- 0,1 pH
    • Calibration: manual, 1 point
    • Battery type: 3 x 1.5V alkaline (700 hrs. of use)

     

    SKU:
    MIPH600

    Retail: $33.95

    Special Price $26.67

  • Milwaukee pH hand meter SM101

    Milwaukee pH hand meter SM101 +/-.02 special order only.
    SKU:
    MISM101

    Retail: $122.95

    Special Price $89.50

  • Hanna GroChek pH/EC/TDS/C Portable Meter w/ Cal Check (HI9813-6N)

    HI 9813-6N is a versatile, water resistant multiparameter portable meter specifically designed for agricultural applications such as hydroponics, greenhouses, farming and nurseries. It features an extra large LCD that clearly displays the parameter being measured as well as calibration instructions. Calibration is fast and easy with knobs located on the front panel of the instrument. HI 9813-6N is a pH/EC/TDS meter designed for simplicity of use in taking pH, mS/cm, ppm and temperature in the °C scale measurements. HI 9813-6 includes all the features of the HI 9813-5 while incorporating our exclusive CAL CHECKTM feature. CAL CHECKTM allows the user to easily check the probe calibration status at any time. Both instruments utilize the HI 1285 series pH/EC/TDS/temperature probe. This probe features a fiber junction and gel electrolyte making it ideal for fertilizer solutions.

    Features

    Water resistant
    On-screen user guides-Save time with on-screen calibration guides
    BEPS (Battery Error Protection System) alerts the user in the event that low battery power could adversely affect readings
    Switch parameters at the touch of a button
    Automatic Temperature Compensation- For pH and conductivity
    Simple calibration-Dials located on the front panel makes calibration quick and simple, even for non-technical users
    Battery % displayed on startup
    Fast response probe included

     

    SKU:
    HI9813-6N

    Retail: $283.95

    Special Price $205.00

  • Hanna GroChek pH/EC/TDS/C Portable Meter w/ Cal Check (DIRECT ONLY)

    HI 9813-5N is a versatile, water resistant multiparameter portable meter specifically designed for agricultural applications such as hydroponics, greenhouses, farming and nurseries. It features an extra large LCD that clearly displays the parameter being measured as well as calibration instructions. Calibration is fast and easy with knobs located on the front panel of the instrument. HI 9813-5N is a pH/EC/TDS meter designed for simplicity of use in taking pH, mS/cm, ppm and temperature in the °C scale measurements.

    Features

    Water resistant
    On-screen user guides-Save time with on-screen calibration guides
    BEPS (Battery Error Protection System) alerts the user in the event that low battery power could adversely affect readings
    Switch parameters at the touch of a button
    Automatic Temperature Compensation- For pH and conductivity
    Simple calibration-Dials located on the front panel makes calibration quick and simple, even for non-technical users
    Battery % displayed on startup
    Fast response probe included

     

    SKU:
    HI9813-5N

    Retail: $264.99

    Special Price $181.99

  • Oakton Waterproof EC Tester 11+

    • Automatically or manually select measuring range
    • Waterproof, dustproof housings float Push-button calibration, HOLD function, and error messages
    Use these testers for either cup-style or dip-style measurements. For cup style, pour a small amount of your sample directly into the sensor cup until it overflows; for dip style, simply immerse tester tip into sample.

    Replaceable sensor lets you reuse meter body many times over. Valox housing and stainless steel electrodes for good chemical compatibility. Note: Before measuring, calibrate tester as either cup style or dip style (depending on intended method of use).
    SKU:
    OK3566235

    Retail: $162.95

    Special Price $115.16

  • Oakton WP EC Tester 11

    •Automatically or manually select measuring range
    •Waterproof, dustproof housings float Push-button calibration, HOLD function, and error messages

    Use this tester for either cup-style or dip-style measurements. For cup style, pour a small amount of your sample directly into the sensor cup until it overflows; for dip style, simply immerse tester tip into sample.

    Replaceable sensor lets you reuse meter body many times over. Valox housing and stainless steel electrodes for good chemical compatibility.

    Note: Before measuring, calibrate tester as either cup style or dip style (depending on intended method of use).

     

    SKU:
    OK3566230

    Retail: $119.95

    Special Price $86.59

  • Replacement pH Sensor PH-200

    This spare pH sensor is for HM Digital Waterproof pH Meter model P-200. Features Glass pH sensor and reference tube and thermister.

    SKU:
    HMDSPP2

    Retail: $49.95

    Special Price $37.36

  • Replacement Platinum Sensor COM-100

    This spare sensor is for HM Digital EC/TDS/Temp Combo Meter model COM-100. Features platinum TDS/EC sensor and thermister.

    SKU:
    HMDSPC1

    Retail: $36.95

    Special Price $27.63

  • Hanna Instruments Primo TDS Tester

    The Primo TDS tester provides a fast and dependable way to measure the Total Dissolved Solids in your water samples. It is ideally suited for the rigorous demands of water quality professionals, who will appreciate the practicality of Primo's easy-to-read LCD when demonstrating the before and after results of conditioning and filtration systems. Temperature is compensated automatically to ensure the readings are consistent to the standard or reference temperature.

    Operating and routine maintenance has never been easier. Primo TDS uses a single button at the top of the meter. Press it once and the meter is powered and ready for use. Press and hold the button for a few seconds and Primo automatically enters calibration mode. Simply open a sachet of the calibration solution, dip the probe and within seconds the meter recognizes the calibration solution and calibrates itself! Maximum battery life is managed by Primo's power microprocessor, which automatically turns it of after 5 minutes of inactivity.

    SKU:
    HIPRIMO

    Retail: $40.95

    Special Price $37.00

  • Hanna Gro'CHEK pHEP 5 Meter

    The pHep 4 and pHep 5 includes features such as a dual-level LCD, battery level indicator, replaceable pH electrode cartridge, instability indicator, automatic shut-off and automatic calibration all in a floating, waterproof casing.

    SKU:
    HI98128

    Retail: $132.95

    Special Price $98.00

  • Hanna Continuous pH/TDS/temp Monitor

    Designed for continuous monitoring of pH, TDS and temperature the HI 981504 is simple to install and can be placed above the sample to be tested. pH, TDS and temperature measurements are simultaneously displayed on three backlit LCDs which can be easily viewed at a distance - even in low light. This means no more switching between parameters.

    The HI 1286 gel-filled pH electrode is provided with a waterproof sheath to protect the BNC connector. The unique design of the electrode provides longer life in aggressive solutions. The HI 7634 TDS probe is easy to clean and requires little maintenance. Measurements are accurate and the meter can be calibrated at one or two points for pH and at a single point for TDS. Temperature range is factory calibrated.

    SKU:
    HI9815047

    Retail: $262.95

    Special Price $210.00

  • Milwaukee pH - EC - TDS KIT

     Milwaukee Instruments AG900 provides instant readings of the three most important factors in efficient plant production: pH, EC, or TDS. The AG900 kit comes with an SM802 hand held microprocessor, calibration solution, measuring cup for soil testing, a comprehensive 21-page Operational and Testing manual, 9v battery as well as a protective carrying case.
    SKU:
    MIAG900
    $239.95
  • Oakton Waterproof TDS Tester11+

    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.

    0-2000 ppm, +/- 1% FS
    SKU:
    OK3566215

    Retail: $159.95

    Special Price $115.16