pH Testing & Control


Save on pH Testing & Control at Mill Hollow Nursery. Top brands include Hanna Instruments, HM Digital Meters, Bluelab, AmHydro, Microbe Life Hydroponics, YARUIFANSEN, Cutting Edge, Myron L Instrumentation, & Microbe Life. Hurry! Limited time offers. Offers valid only while supplies last.



Hanna Instruments GroChek pH/EC/TDS/C/PPT Pocket Tester
By Hanna Instruments
In Stock
$204.98

mpn: HI98130, ean: 6853848718927,

4.7 out of 5 stars with 31 reviews
Here is a waterproof tester that offers high accuracy pH, EC/TDS, and temperature measurements in a single tester! No more switching between meters for your routine measurements. This floating, waterproof combination tester has an easy to read LCD and an automatic shut-off. pH and EC/TDS readings are automatically temperature compensated. This tester features a replaceable pH electrode cartridge with an extendable cloth junction as well as an EC/TDS graphite electrode. The extendable cloth


HM Digital HMDPH200 Waterproof PH & Temperature Meter
By HM Digital Meters
In Stock
$79.23

mpn: HMDPH200, ean: 0891144000021,

4.8 out of 5 stars with 26 reviews
FEATURES Measures pH and temperature Auto-ranging three point calibration with digital fine tuning Includes 4 pH buffer solution in a sponge embedded in a clear cap, so you can see if it's dried up Waterproof housing Simultaneous temperature display Measurement Range: 0-14 pH Digital Calibration (push button) 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 PH-200 meter is


Bluelab pH Up, 1 gal Bottle, case of 4
By Bluelab
In Stock
$293.04

mpn: BLU8008, ean: 9421024920708,

4.8 out of 5 stars with 57 reviews
Optimum growth needs optimum pH. And Bluelab makes optimum simple. If your pH isn't in the right range—and that's 5.5-6.5 for most plant varieties—your nutrients are likely wasted. Too high or too low, and you're in trouble. The result is nutrient deficiency or complete nutrient lockout. A sure way to unhappy, unhealthy—even dying—plants. Bluelab pH Up Solution is formulated to the highest standards. Just add what's required to raise pH. Your plants will thank you for it. The main thing


AmHydro GroMagnon Plant Growth Nutrients
By AmHydro
In Stock
$119.95

ean: 0852721006287,

4.8 out of 5 stars with 36 reviews
NPK: 10-6-17 High performance growth nutrient formulation developed to push plant productivity during the high growth stage of most flowering crops including cannabis. This is the sister of our famous AmHydro Big Bang Bloom nutrient formulation that has pushed the limits of the flowering / fruiting stages of crops like tomatoes, cucumbers, peppers and cannabis for years. For use with soil and hydroponic systems. Working Solution: The solution in your main reservoir that your plants are using to


MICROBE Life Hydroponics pH Down Gallon
By Microbe Life Hydroponics
In Stock
$120.72

mpn: PH21404, ean: 0097121214058,

4.5 out of 5 stars with 12 reviews
Microbe Life Hydroponics pH DOWN is formulated with R/O and UV sterilized water and combines two pH adjusters for buffered effectiveness. It contains three electrolytes to help maintain osmotic balance.• Safely lowers pH levels• Combines 2 pH adjusters for buffered effectiveness• Contains 3 electrolytes to help maintain osmotic balance• Will not harm plants.


Bluelab pH Probe Meter for Plant Germination (3-Pack)
By Bluelab
In Stock
$299.95

ean: 7426934885071,

4.6 out of 5 stars with 56 reviews
Easy to clean because of its bullet shaped glass bulb. Fully waterproof and less fragile than all-glass electrodes because of its tough polypropylene barrel. Gel filled (non-refillable) making it maintenance free and a double junction reference providing longer life.Easy to clean and fully waterproof. Tough polypropylene barrel base with bullet shaped glass bulb. Gel-filled making it maintenance free and providing a longer life.


Hanna GroChek pH/EC/TDS/C Portable Meter w/Cal Check
By Hanna Instruments
In Stock
$298.78

mpn: HI9813-5N,

4.3 out of 5 stars with 56 reviews
HI 9813-5 is a versatile, water resistant, multiparameter portable instrument specifically designed for agricultural applications such as hydroponics, greenhouses, farming and nurseries. This meter features an 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 9813-5 is a pH/EC/TDS meter designed for simplicity of use in taking pH, mS/cm, ppm and temperature in


CT-6659 Professinal PH ORP Controller Digital LCD Oxidation Redox Potential Meter pH Value Measure Analyzer with ATC 4-20mA Output
By YARUIFANSEN
In Stock
$395.00

ean: 0791281232029,

4.3 out of 5 stars with 24 reviews
CT-6659 Professinal PH ORP Controller Digital LCD Oxidation Redox Potential Meter pH Value Measure Analyzer With ATC 4-20mA Output Packaging Details Unit Type: piece Package Weight: 0.8kg (1.76lb.) Package Size: 18cm x 12cm x 10cm (7.09in x 4.72in x 3.94in).


Bluelab pH Down, 1 Liter Bottle, case of 12
By Bluelab
In Stock
$258.48

mpn: BLU8006, ean: 9421024920753,

4.8 out of 5 stars with 43 reviews
Optimum growth needs optimum pH. And Bluelab makes optimum simple. If your pH isn't in the right range—and that's 5.5-6.5 for most plant varieties—your nutrients are likely wasted. Too high or too low, and you're in trouble. The result is nutrient deficiency or complete nutrient lockout. A sure way to unhappy, unhealthy—even dying—plants. Bluelab pH Down Solution is formulated to the highest standards. Just add what's required to reduce pH. Your plants will thank you for it. The main


Cutting Edge Solutions pH Up, 1 qt, case of 12
By Cutting Edge
In Stock
$207.00

mpn: CES3701, ean: 0817867011588,

4.6 out of 5 stars with 17 reviews
CES pH Up™Concentrated pH adjustment liquid, alkaline buffer raises water and nutrient solution pH. Highly concentrated, use conservatively. Slowly add to pure water or nutrient solution, at small intervals. Note beginning reading and then test pH. Repeat small application process and stir well, until desired pH is achieved. Amount of CES pH Up™ required for adjustment will vary, depending on the strength of nutrient mixture and purity of the water source used. May be diluted when


Bluelab pH Up, 500 ml Bottle, case of 20
By Bluelab
In Stock
$264.33

mpn: BLU8010, ean: 9421024920722,

4.7 out of 5 stars with 25 reviews
Optimum growth needs optimum pH. And Bluelab makes optimum simple. If your pH isn't in the right range—and that's 5.5-6.5 for most plant varieties—your nutrients are likely wasted. Too high or too low, and you're in trouble. The result is nutrient deficiency or complete nutrient lockout. A sure way to unhappy, unhealthy—even dying—plants. Bluelab pH Up Solution is formulated to the highest standards. Just add what's required to raise pH. Your plants will thank you for it. The main thing


Bluelab pH Down, 1 gal Bottle, case of 4
By Bluelab
In Stock
$264.87

mpn: BLU8005, ean: 9421024920715,

4.4 out of 5 stars with 58 reviews
Optimum growth needs optimum pH. And Bluelab makes optimum simple. If your pH isn't in the right range—and that's 5.5-6.5 for most plant varieties—your nutrients are likely wasted. Too high or too low, and you're in trouble. The result is nutrient deficiency or complete nutrient lockout. A sure way to unhappy, unhealthy—even dying—plants. Bluelab pH Down Solution is formulated to the highest standards. Just add what's required to reduce pH. Your plants will thank you for it. The main


Cutting Edge Solutions pH Up, 1 gal, case of 4
By Cutting Edge
In Stock
$187.20

mpn: CES3704, ean: 0817867011595,

4.7 out of 5 stars with 16 reviews
CES pH Up™Concentrated pH adjustment liquid, alkaline buffer raises water and nutrient solution pH. Highly concentrated, use conservatively. Slowly add to pure water or nutrient solution, at small intervals. Note beginning reading and then test pH. Repeat small application process and stir well, until desired pH is achieved. Amount of CES pH Up™ required for adjustment will vary, depending on the strength of nutrient mixture and purity of the water source used. May be diluted when


Bluelab pH Down, 500 ml Bottle, case of 20
By Bluelab
In Stock
$273.60

mpn: BLU8007, ean: 9421024920739,

4.4 out of 5 stars with 12 reviews
Optimum growth needs optimum pH. And Bluelab makes optimum simple. If your pH isn't in the right range—and that's 5.5-6.5 for most plant varieties—your nutrients are likely wasted. Too high or too low, and you're in trouble. The result is nutrient deficiency or complete nutrient lockout. A sure way to unhappy, unhealthy—even dying—plants. Bluelab pH Down Solution is formulated to the highest standards. Just add what's required to reduce pH. Your plants will thank you for it. The main


Cutting Edge Solutions pH Down, 1 gal, case of 4
By Cutting Edge
In Stock
$187.20

mpn: CES3604, ean: 0817867011618,

4.0 out of 5 stars with 12 reviews
CES pH Down™Concentrated pH adjustment liquid, acidic buffer lowers water and nutrient solution pH. Highly concentrated, use conservatively. Slowly add to pure water or nutrient solution, at small intervals. Note beginning reading and then test pH. Repeat small application process and stir well, until desired pH is achieved. Amount of CES pH Down™ required for adjustment will vary, depending on the strength of nutrient mixture and purity of the water source used. May be diluted


Cutting Edge Solutions pH Down, 1 qt, case of 12
By Cutting Edge
In Stock
$207.00

mpn: CES3601, ean: 0817867011601,

4.1 out of 5 stars with 37 reviews
CES pH Down™Concentrated pH adjustment liquid, acidic buffer lowers water and nutrient solution pH. Highly concentrated, use conservatively. Slowly add to pure water or nutrient solution, at small intervals. Note beginning reading and then test pH. Repeat small application process and stir well, until desired pH is achieved. Amount of CES pH Down™ required for adjustment will vary, depending on the strength of nutrient mixture and purity of the water source used. May be diluted


Microbe Life Hydroponics pH UP, 2.5 gal
By Microbe Life Hydroponics
In Stock
$160.96

mpn: ML21401, ean: 0097121214010,

4.3 out of 5 stars with 28 reviews
Microbe Life Hydroponics pH UP is formulated with R/O and UV sterilized water and combines two pH adjusters for buffered effectiveness. It contains three electrolytes to help maintain osmotic balance.• Safely raises pH levels• Combines 2 pH adjusters for buffered effectiveness• Contains 3 electrolytes to help maintain osmotic balance• Will not harm plants .


TDS/Conductivity/Salinity Pocket Pen
By Myron L Instrumentation
In Stock
$245.29

mpn: JLPT1,

4.8 out of 5 stars with 48 reviews
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


Hanna Portable Dissolved Oxygen Meter, Waterproof, 115v
By Hanna Instruments
In Stock
$1,445.35

mpn: HI9818601,

4.8 out of 5 stars with 39 reviews
• Automatic or manual calibration, for preferred level of control• Built-in calculation of biochemical oxygen demand (BOD), Oxygen Uptake Rate (OUR), and Specific Oxygen Uptake Rate (SOUR), to eliminate extra calculations• One or two-point automatic dissolved oxygen calibration, for ease of use• Automatic temperature compensation (ATC), to eliminate extra calculations• USB connection, for easy data download to Windows  .


MICROBE Life Hydroponics pH Down 32oz
By Microbe Life
In Stock
$29.09

mpn: 4316276127, ean: 0097121214034,

4.4 out of 5 stars with 41 reviews
It is formulated with R/O and UV sterilized water and combine two pH adjusters for buffered effectiveness. It contains three electrolytes to help maintain osmotic balance.It will never harm plants. ML/pH DOWN safely lowers pH in nutrient solutions.



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