Meters & Dosers

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

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  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)

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A well-blended solution is key to a successful dosing system. A must have! One way to get that homogenized blend is to add a mixing chamber to the Nutrient Delivery System. Kit includes mixing chamber, unions, nipples, and roll of Teflon tape. This is for a 1-1/2 in system. Assembly required.

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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.

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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.

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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.

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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

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GroStar GS4 pH/EC/500ppm/700ppm/Temp (5-in-1) Combo Pen Product Details AI21040 - GroStar GS4 pH/EC/500ppm/700ppm & Temp (5-in-1) Combo Pen Lab grade instruments designed specifically for growers! Includes:  pH 7 & pH 4 calibration solution (50ml bottle each), 2.77 EC (50ml bottle) and KCL storage solution (10ml bottle), lanyard and user manual Measures pH, conductivity (EC and 500ppm/700ppm) and temperature (5-in-1) Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance Easy-to-use design and fast calibration adjustment Double junction replaceable probe, so you don’t have to discard the entire pen when the probe reaches its end of life Large 3-color backlit screen gives you clear information Durable structure, IP67 waterproof Powered by AAA batteries with auto off function Automatic temperature compensation 2-year warranty on pen, 1-year warranty on probe Compatible with all Apera GroStar probes

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Ideal for commercial use, the TDS-3 includes a carrying case with belt clip. It is highly efficent and accurate due to its advanced microprocessor technology. It features a measurement range of 0-9990 ppm. From 0-999 ppm, the resolution is in increments of 1 ppm. From 1000 to 9990 ppm, the resolution is in increments of 10 ppm, indicated by a blinking image.

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For use with HM Digital's PH-200 and PH-80 (as well as other brands of pH meters). Always make sure your sensor is kept in an electrode storage solution. If dry, refill the pH meter cap with the PH-STOR storage solution. The sponge should be moist (not soaking wet).

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The PH-80 is an economically priced, reliable pH meter that is ideal for testing applications such as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water and more.   FEATURES   Measures pH and temperature One-touch automatic digital calibration Water resistant Simultaneous temperature display Sleek, lightweight design Large LCD display Automatic Temperature Compensation (ATC) Auto-off function, data-hold function and low-battery indicator Includes storage solution in a sponge embedded in a translucent cap Factory Calibrated: The PH-80 meter is factory calibration to pH 7.0. The meter can easily and quickly be recalibrated with digital calibration to pH 4.0, 7.0 or 10.0 using the meter's simple one-touch process Includes a cap, batteries, storage solution and pH 7.0 buffer

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NaCl calibration solution 1000 ppm comes in lightweight HDPE plastic bottles. Sealed with a coated foam liner.

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Dosatron water powered doser is directly installed in the water supply line. The Dosatron operates by using water pressure as the power source (no electricity needed). The water activates the Dosatron, which takes up the required percentage of concentrate. Inside the Dosatron, the concentrate is mixed with the water. The water pressure forces the solution downstream. Operating pressure range is 4.3 -85 PSI and water flow range is 0.05 - 11 GPM. Injection capabilities of 1:500 to 1:50 (0.2 to 2%) [0.256 to 2.560 ounces per gallon]. Unit has 3/4 in NPT connections. Includes mounting bracket, suction hose, bypass, union, weighted strainer, and quick start guide. Mini-maintenance seal kit for Dosatron Dosers - should be replaced on an annual basis.

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The Dosatron CV34-PH check valve features a poly construction and is for use with Dosatron viton seal units requiring a 3/4" connection.

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Measure for measure, the Hydrofarm Mini Measure Shot Glass is ideal for home, lawn, garden, or kitchen. It features dishwasher safe construction, permanent markings, high visibility, and a heavy base to reduce tipping. Use the shot glass to measure water, nutrients, and other liquids in teaspoons, tablespoons, ounces, and milliliters. Ideal for home, lawn, garden, or kitchen Dishwasher safe construction, permanent markings, high visibility Heavy base to reduce tipping Use to measure water, nutrients, and other liquids in teaspoons, tablespoons, ounces, and milliliters Pack of 12

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With so many choices in measuring instruments on the market, how do you choose? Select the item that gives you the most for your money, in an all-in-one, long-lasting product. Hydrofarm's heavy duty measuring beaker offers easy-to-read, permanent print markings delineating cups, milliliters, pints, and ounces, all around a sturdy plastic container. Two pour spouts make this beaker the most accessible one on the market. You'll never have to twist your wrist or guesstimate again because you can't read the other side - simply turn the beaker facing you to the desired measurement for your media or ingredients, then fill and pour. Use the spout on the opposite side for a second round of pouring as needed. Indoor gardening enthusiasts - both left- and right-handed - will appreciate the convenience of this beaker. The beaker's wide, thick base ensures against tip over, and its dishwasher-safe construction means easy and quick cleanup. Available in a case quantity of 12, Hydrofarm beakers allow you to stock your shelves - or just stock up - to get your fill. Features Sturdy plastic construction Permanent green markings Cups, milliliters, pints, and ounce markings Wide thick base Two pour spouts Dishwasher safe material Custom box for attractive display

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The HM Digital Hydromaster EC/TDS Probe is a replacement part for the HydroMaster HM-500.

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GroStar GS4-E replacement pH/EC combo electrode Product Details AI58040 - GroStar GS4-E replacement pH/EC combo electrode Measures pH, conductivity (EC and PPM) and temperature Combo probe built with lithium glass membrane and titanium alloy to ensure high accuracy and durability Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance Double junction structure uses blue gel electrolyte without the air bubble 1-year warranty

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GroStar GS3-E replacement EC electrode Product Details AI58030 - GroStar GS3-E replacement EC electrode Measures conductivity EC, PPM (500), PPM (700) and temperature Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance Titanium alloy sensor designed for high accuracy EC measurement 1-year warranty

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GroStar GS3 EC Pen Product Details AI11030 - GroStar GS3 EC/PPM/Temp Pen Lab grade instruments designed specifically for growers! Includes: 2.77 EC calibration solution (50 ml bottle) Measures conductivity EC, PPM (500), PPM (700) and temperature Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance Titanium alloy sensor designed for high accuracy EC measurement Easy-to-use design and fast calibration adjustment. Large 3-color backlit screen gives you clear information Durable structure, IP67 waterproof Replaceable probe Powered by AAA batteries with auto off function Automatic temperature compensation 2-year warranty on pen, 1-year warranty on probe

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GroStar EC Calibration Kit (2.77 EC, 8 oz. each) Product Details GroStar by Apera EC Calibration Kit (2.77 EC, 8 oz. each) 2.77 EC conductivity standard calibration solution Used as a reference or checking solution to ensure you have adequately cleaned the EC/ppm probe Calibration Solution should be stored in a cool place out of direct sun and heat. Non-hazardous product Please keep out of reach of children  Made in USA

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Inject nutrients, supplements/additives and pH adjusters into irrigation water with ease. No electricity needed. Dosatron is a passive precision fertilizer doser that accurately mixes from the pressure of your incoming water. w/ Kalrez Seals Model: DM14MZ3000

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Simplify your nutrients by directly installing Dosatron Doser into the water supply line. The Dosatron Doser operates by using water pressure as the power source (no electricity needed). The water activates the Dosatron, which takes up the required percentage of concentrate. Inside the Dosatron, the concentrate is mixed with the water. The water pressure forces the solution downstream. Operating pressure range is 4.3 to 85 PSI and water flow range is 0.05 to 40 GPM. Injection capabilities of 1:500 to 1:50 (0.2 to 2%) [ 0.256 to 2.560 ounces per gallon]. Includes mounting bracket, suction hose, bypass, union, weighted strainer, and quick start guide. Mini-maintenance seal kit for Dosatron Dosers - should be replaced on an annual basis.

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This water powered doser is directly installed into the water supply line. Dosatron Doser operates by using water pressure as the power source (no electricity needed). The water activates the Dosatron, which takes up the required percentage of concentrate. Inside the Dosatron, the concentrate is mixed with the water. The water pressure forces the solution downstream. Operating pressure range is 4.3 -85 PSI and water flow range is 0.05 - 14 GPM. Injection capabilities of 1:3000 to 1:333 ( 0.03 to 0.3%) [0.384 to 0.0425 ounces per gallon]. Unit has 3/4 in NPT connections. Includes mounting bracket, suction hose, bypass, union, weighted strainer, and quick start guide. Mini-maintenance seal kit for Dosatron Dosers - should be replaced on an annual basis.

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The Dosatron water powered doser inject nutrients, supplements/additives and pH adjusters into irrigation water with ease. Dosatron is a passive precision fertilizer doser that accurately mixes from the pressure of your incoming water (no electricity needed). The water pressure forces the solution downstream. Operating pressure range is 7 -85 PSI and water flow range is 0.05 - 14 GPM. Injection capabilities of 1:100 to 1:10 (1 to 10%) [1.280 to 12.800 ounces per gallon]. Unit has 3/4 in NPT connections. Includes mounting bracket, suction hose, bypass, union, weighted strainer, and quick start guide. Mini-maintenance seal kit for Dosatron Dosers - should be replaced on an annual basis.

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Inject nutrients, supplements/additives and pH adjusters into irrigation water with ease. No electricity needed. Dosatron is a passive precision fertilizer doser that accurately mixes from the pressure of your incoming water. Operating pressure range is 4.3 -85 PSI and water flow range is 0.05 - 11 GPM. Injection capabilities of 1:1000 to 1:112 (0.1 - 0.9%) [3.5 ml to 35 ml per gallon]. The unit has 3/4 in NPT connections. Includes mounting bracket, suction hose, bypass, union, weighted strainer, and quick start guide. Mini-maintenance seal kit for Dosatron Dosers - should be replaced on an annual basis.

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The Dosatron CV112 check valve features a poly construction and is for use with Dosatron viton seal units requiring a 1 1/2" connection.

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Dosatron’s Nutrient Delivery System (NDS) includes the Starter Kit, Mixing Chamber Kit, Monitor Kit OR End Kit, and Water Hammer Arrestor Kit.

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Includes: Union, Check Valve, Elbows, Nipples, Hose Adapter, Banjo Ball Valves, Cross fitting, Y Filter, Pressure Gauge, Roll of Pink Teflon Tape.   

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Protect your Dosatron Nutrient Delivery System with all the necessary accessories for a successful installation. The kit includes all the parts you need to get started including elbow, unions, check valve, ball valve, Y filter, tee, female coupler, pressure gauge, nipples, hose adaptor, and pink Teflon tape. This is for a 1-1/2 in system. Assembly required.

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Dosatron NDS - Start Kit 3/4inDosatron Nutrient Delivery System - Start Kit 3/4 in (HYKSTART)Protect your Dosatron Nutrient Delivery System with all the necessary accessories for a successful installation. Includes incoming on/off ball valve, an in-line pre-filter with 200 mesh (80 micron) screen, a pressure regulator with gauge, a fresh water test port, a check valve and all necessary 3/4 in plumbing connections to put it all together. Assembly required.

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Inline filter kit includes a cleanable, permanent, stainless steel filter that is a 200 mesh/80 micron. The inline connectors are 3/4 in FPT by 3/4 in FPT. No replacement cartridges necessary.

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Flow Restrictors limit the flow of liquid in the line. It is recommended to install a flow restrictor on the inlet side of the Dosatron unit if there is any possibility of overflowing the unit. Choose from 3/4 in 10 GPM (FR34-10GPM) or 3/4 in 14 GPM (FR34-14GPM).

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Flow Restrictors limit the flow of liquid in the line. It is recommended to install a flow restrictor on the inlet side of the Dosatron unit if there is any possibility of overflowing the unit. Choose from 3/4 in 10 GPM (FR34-10GPM) or 3/4 in 14 GPM (FR34-14GPM).

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The eOne MF is a multifunction microprocessor dosing pump, suitable for applications which require proportional dosing. The pump operates at a dosing frequency up to 180 impulses/minute, and is equipped with backlit graphic display for correct setting of the various programming parameters. It has a flow rate of 0.26 gph and a max pressure of 1.45 psi. Included eOne MF 0110 pump, polyethylene panel, PVC suction tube, PVC priming discharge tube, polyethylene discharge tube, water meter, check valve, pressure relief valve, injection valve, unions, foot filter and mixing chamber. Choose the size and orientation that works best for your set up.

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Dilution Solution’s Nutrient Delivery System (NDS) includes the Starter Kit, Mixing Chamber Kit, Monitor Kit, and Water Hammer Arrestor Kit. The Monitor Kit provides an in-line nutrient monitor that measures and displays your well-blended, outgoing solution, providing peace of mind.

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Precise, simple and reliable are words that describe D20S. Installed directly in the water supply line, the Dosatron operates by using water pressure as the power source. The water activates the Dosatron, which takes up the required percentage of concentrate. Inside the Dosatron, the concentrate is mixed with the water. The water pressure forces the solution downstream. The dose of concentrate will be directly proportional to the volume of water entering the Dosatron, regardless of variations in flow or pressure which may occur in the main line. Accessories include the following: Mounting bracket Manual bypass Suction hose with strainer and weight Operating manual Set of legs Suction hose with strainer Vacuum breaker Recommended: 200 mesh filter, check valve, pressure regulator, flow restrictor.   Technical Specifications: Weight: 47 lbs Pipe Size: 2 inch NPT Dimensions: 55 inch x 15 inch (With legs) 42 inch x 15 inch; (No legs) GPM: 5.00 to 100.0 GPM; 18.9 to 379.0 LPM PSI: 2.00 to 120.0 PSI Ratio: 1:500 to 1:50 Percentage: 0.20 to 2.00%

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Light blocking mixing chamber sunshade for 3/4″ mixing chambers. Prevents the light from impacting nutrient rich water, eliminating the potential for biofilm and algae growth in the chamber. Removable cover for the clear bowl portion of the mixing chamber.

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Dosatron 200 Mesh Filter installs on the inlet side of the Dosatron injector to keep the system free of debris.

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Gardeners can conveniently test their moisture, light, and pH levels with the handy Active Air 3-Way Meter. Moisture readings register on a scale of 0 (dry) to 10 (moist); light readings range from 0 LUX (low light) to 2000 LUX (very strong light); accurate pH readings range between pH 3.5 and 8. 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.

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