pH & PPM

2 Pack pH Meter and TDS Meter, 0.05 pH High Accuracy Tester Pen, ± 2% Readout Accuracy Digital Water Quality Filter Pen, 0-9990ppm, Ideal Water Purity Test for Drinking Water, Aquariums, Hydroponics
$11.99 Buy Now
3 in 1 PH Meter with TDS/Temp Meter, TDS Water Tester ±0.05 PH High Accuracy with 0-14 PH Measurement Range for Drinking Water, Aquarium, Hydroponics
$33.99 Buy Now
3 in 1 TDS EC Temperature Meter Pen, Digital Water Tester Kit PPM EC Meter for Drinking Water Hydroponics Aquarium RO System and Pool
$10.99 Buy Now
AERO-GRO Digital 4-in-1 Water Quality Testing Kit – High Accuracy Digital pH/TDS/EC/Temp Pen Set Perfect for Hydroponics, Pools, Koi Ponds, Drinking Water, Wine/Beer Making, Hot Tub, Spa, Aquarium
$44.99 Buy Now
Apera GroStar Series GS4 pH/EC/500ppm/700ppm Combo 5-in-1 Pen Tester Kit (Gen II) with Replaceable Double-Junction pH/EC Probe for Hydroponics Water Quality Testing
$149.53 Buy Now
APERA INSTRUMENTS AI209-T Value Series PH20 pH Tester Combo Kit, including the Maintenance Set, and a CalPod Solution Holder for Easy Calibration
$79.07 Buy Now
Apera Instruments AI311 Premium Series PH60 Waterproof pH Pocket Tester Kit, Replaceable Probe, ±0.01 pH Accuracy
$78.70 Buy Now
Atlas Scientific pH Down Two Pack 250ml (16oz Total)
$15.99 Buy Now
Atlas Scientific pH Up 3 Liter Box
$25.99 Buy Now
Atlas Scientific pH Up and Down 250ml (8oz)
$22.03 Buy Now
Banger Labs Premium pH Up Solution
$24.00 Buy Now
Banger Labs Premium pH up Solution 1 Quart
$14.00 Buy Now
Black Magic pH Down – Premium Buffer to Lower Nutrient Solution pH, Concentrated Acidic Formula, 8 fl. oz.
$7.91 Buy Now
Black Magic pH Up – Premium Buffer to Raise Nutrient Solution pH, Concentrated Base Formula, 8 fl. oz.
$10.66 Buy Now
Bloom City Professional pH Up + Down Control Kit for Optimal Nutrient Uptake (Two 1/2 Pint Bottles) 16 Total oz
$17.99 Buy Now
Bloom City Professional pH Up Liquid Fertilizer, Quart (32 oz)
$18.90 Buy Now
Bluelab CONTPHCON pH Controller Connect with Monitoring, Dosing, and Data Logging in Water (Stick not Included) Digital Meter for Hydroponic System and Indoor Plant Grow, White
$416.62 Buy Now
Bluelab CONTPRO Pro Controller for Fully Automated 24/7 Digital Monitor, Dosing, and Data Logging of Hydroponics Reservoir (Base Only, No Pump), includes pH, EC, and temperature probe
$1,132.49 Buy Now
Bluelab METCOMPLUS Combo Meter PLUS for pH, Temperature, and Conductivity in Water and Soil with Easy Calibration, Digital Nutrient (TDS) Testing Kit for Hydroponic System and Indoor Plant Grow
$327.95 Buy Now
Bluelab METPULSE Pulse Meter Water 3-in-1 Moisture/Nutrient (TDS)/Temperature Test Kit for Garden Soil, Coco, and Solution, Ester for Hydroponic System and Indoor Plant Grow, Clear
$308.00 Buy Now
Bluelab MONGUA Guardian Monitor for pH, Temperature, and Conductivity (TDS) Measurements in Water with Easy Calibration, 3 in 1 Digital Nutrient Meter for Hydroponic System and Indoor Plant Grow White
$279.99 Buy Now
Bluelab MONGUACON Guardian Monitor Connect for pH, Temperature, and TDS in Water with Data Logging (Connect Stick not Included), Nutrient Meter for Hydroponic System and Indoor Plant Grow White
$283.09 Buy Now
Bluelab PENGTB Grower’s Toolbox with pH Pen, Conductivity Tester and Probe Care Kit, Easy Calibration, Digital Meters for Hydroponic System and Indoor Plant Grow
$155.84 Buy Now
Bluelab PENSOILPH Soil pH Pen, Digital Meter and Water Test Kit, Also Used for Coco and Rockwool with Easy Calibration for Hydroponic System and Indoor Plant Grow, Clear
$153.12 Buy Now
Bluelab PERIPODM3 Peripod M3 for Pro Controller, Dosing for pH and Nutrient, 3 Pumps with Accessories (Pro Controller Sold Separately), Tool for Hydroponic System and Indoor Plant Grow
$676.02 Buy Now
Bluelab PERIPODM4 Peripod M4 for Pro Controller
$898.16 Buy Now
bluelab pH Pen-Digital pH Tester – Reliable & Accurate for High Yield Crops – Hand-Held Meter – Measures pH & Temperature in Solutions and Soil Solutions – Optimize Plant Health & Performance,White
$80.63 Buy Now
Bluelab TRUNV2 Truncheon Nutrient Meter, Digital Conductivity Tester in Water (Scales Include: EC, 500, ppm 700, CF, TDS) Tool for Hydroponic System and Indoor Plant Grow, White
$84.49 Buy Now
CANNABMALL PH Meter, TDS PPM Meter and 3 in 1 Soil Moisture Meter Combo
$19.99 Buy Now
CIZTADA Smart PH Tester for Water Hydroponics Digital PH EC TDS Meter with ATC High Accuracy Multi-Functional Water Tester for Indoor Plant Grow, DWC, Wine, Pools& Spas and Aquariums
$19.99 Buy Now
Digital PH Meter for Water, 0.01PH High Accuracy Pen Type PH Tester for Hydroponics, Household Drinking, Pool and Aquarium
$7.99 Buy Now
Digital Water pH Meter, Dr.meter 0.01 Resolution High Accuracy PH Testing Pen with Backlit and Data Hold, 0-14pH Measurement Range Water Quality Tester for Hydroponics, Pool, Aquarium, Brewing
$29.99 Buy Now
FOOP pH Up and Down – pH Control Kit | Corrects pH Imbalances, Maximizes Nutrient Absorption, Prevents Sickly Plants | Safe, Fast, and Easy to Use | Works Great in Any Growing Medium (16oz Pair)
$24.99 Buy Now
Foxfarm Cultivation Nation PH Down – 1 Qt.
$21.74 Buy Now
FoxFarm Cultivation Nation PH Up Quart
$26.92 Buy Now
Garden Tutor Soil pH Test Kit (3.5-9 Range) | 100 Soil pH Test Strips
$12.98 Buy Now
General Hydroponics pH Control Kit for a Balanced Nutrient Solution
$19.32 Buy Now
General Hydroponics pH Down – 8 Oz
$15.99 Buy Now
General Hydroponics pH Down Liquid Premium Buffering For Stability, 1-Gallon, Orange
$33.88 Buy Now
General Hydroponics PH Down Qt. – ACID
$15.88 Buy Now
General Hydroponics pH Up – 8 Oz
$16.49 Buy Now
General Hydroponics pH Up Liquid Premium Buffering For pH Stability, 1-Gallon
$31.29 Buy Now
GuDoQi PH Meter, TDS Meter Combo, Pool Water Test Kit, PH Tester Digital, PPM Meter, 0.01 Resolution TDS PH EC Temperature 4 in 1 Set for Drinking Water, Hydroponics, RO System, Aquarium, Swimming
$11.99 Buy Now
HM Digital PH-80 pH Meter Waterproof PH80 Tester HydroTester
$29.50 Buy Now
Humboldts Secret pH Down | Liquid pH Plant Balancer for Soil & Hydroponics Growing System
$15.99 Buy Now
Indo pH Down Hard Water – Strong Formulation for Hard Water – Helps Maintain Optimum pH Levels (1 L / 32 oz)
$19.95 Buy Now
MICROBE LIFE HYDROPONICS pH Up Liquid Premium Buffering for pH Stability, Increases pH Levels When Nutrient pH is too Low, 16oz
$11.35 Buy Now
MICROBE LIFE HYDROPONICS pH Up Liquid Premium Buffering for pH Stability, Increases pH Levels When Nutrient pH is too Low, 32oz
$17.99 Buy Now
MICROBE Life HYDROPONICS PH21402 pH Control Liquid Premium Buffering for pH Stability, Decreases pH Levels When Nutrient pH is Too High, 16 Ounces
$10.95 Buy Now
MICROBE Life HYDROPONICS PHPHACP pH Control Kit with pH Up & ph Down Liquid for pH Stability, 16 Ounce Bottles, with 4 Ounce Sample of Premium Photosynthesis Plus Liquid Nutrients
$19.40 Buy Now
PH and TDS Meter Combo, Tuecota Digital ph Water Tester, 3-in-1 TDS Temperature & EC Meter, Digital Water Tester, Ultrahigh Accuracy Water Quality Tester for Drinking Water, Hydroponics, Aquarium etc
$12.99 Buy Now
PH Down – (Premium Organic Plant Nutrients & Amendments) Hopwood Farms – YT: Illinois Growers Club
$11.99 Buy Now
pH Indicator Test Drops, Universal Application (pH 2.0-10.0), 100 Tests| for Drinking Water, Urine, and Saliva | Contains 10 ml Bottle of Solution and 20 ml Screw Top Plastic Bottle
$7.49 Buy Now
PH Meter for Water Hydroponics Digital PH Tester Pen
$12.99 Buy Now
PH Meter Tester Kit, Digital PH Meter, 0.01 Resolution
$10.49 Buy Now
PH Meter, TDS PPM Meter, 3 in 1 Soil PH Tester [Upgraded Version] Moisture Meter Combo, PH/EC Tester Digital Kit for Home Water, Hydroponics, Plants Garden Soil and Aquarium Use
$19.99 Buy Now
PH Meter, TDS PPM Meter, Soil PH Tester, PH/EC Digital Kit, 3 Pack
$19.85 Buy Now
pH Meter,Accurate and calibrated pH Tester for Hydroponic System,Pools, Koi Ponds, Drinking Water, Wine/Beer Brewing, Hot Tub, Spa, Aquarium
$14.00 Buy Now
PH Meter,Water Tester 5 in 1 PH/TDS/Salinity/Temp&EC Meter,PH Meter for Water,IP67 Waterproof PH Pen,PPM Meter with Backlit,Salinity Tester for Saltwater Aquarium,Swimming Pool&Seawater.
$38.99 Buy Now
PH Tester, TDS PPM Meter, Soil PH Meter 3-in-1 PH/EC Digital Kit – Lab PH Meters, Soil Moisture Tester, TDS and EC Pen Combo for Water, Home, Hydroponics, Plants Garden Soil and Aquarium
$19.77 Buy Now
Safer Gro SG9920QT Ph Down Lowers Water
$19.65 Buy Now
Viagrow VGPDD501 Natural pH Down Adjusting Crystals, 1 LB, LB, Green
$14.15 Buy Now
VIVOSUN Digital PH Meter for Water, 0.05ph High Accuracy Pen Type PH Tester for Hydroponics, Household Drinking, Pool and Aquarium
$11.19 Buy Now
VIVOSUN pH and TDS Meter Combo, 0.05ph High Accuracy Pen Type pH Meter ± 2% Readout Accuracy 3-in-1 TDS EC Temperature Meter for Hydroponics, Household Drinking, and Aquarium, UL Certified
$18.99 Buy Now
VIVOSUN PH Meter Digital PH Tester Pen 0.01 High Accuracy Water Quality Tester with 0-14 PH Measurement Range for Hydroponics, Household Drinking, Pool and Aquarium, with ATC, Orange
$12.99 Buy Now
Wide Range pH Indicator Solution: 30 mL Plus 2 Empty Capped Sample Vials — Includes Easy to Read 0.5 pH Increment Color Chart
$10.00 Buy Now
Yewhick WiFi Water Quality Monitor with Controller, Online pH TDS Monitor for RO Water System, Zero Water, Hard Water, Hydroponics System Agricultural Irrigation, Support Tuya APP Remote Control
$85.99 Buy Now
YINMIK Digital pH Meter for Food, pH Probe for Sourdough and Bread Dough, Checking The pH of Fermenting Sausages and Salami, Waterproof pH Tester for Solid and Liquid Soft Soil Sample
$45.99 Buy Now
YINMIK PH Meter, Digital 4 in 1 PH EC TDS Temp Meter for Hydroponics
$25.49 Buy Now
YINMIK pH Meter, Digital pH Tester for Hydroponics, pH Temp Meter with Horizontal Display for Pool, Spa, Hot Tub, Indoor Plants, Koi Ponds, Drinking Water, Wine Beer Making, Aquarium, Aquaculture
$13.99 Buy Now
YINMIK Water PH Meter, 3 in 1 PH TDS Temp Pen Type Tester
$25.99 Buy Now

2 Pack pH Meter and TDS Meter, 0.05 pH High Accuracy Tester Pen, ± 2% Readout Accuracy Digital Water Quality Filter Pen, 0-9990ppm, Ideal Water Purity Test for Drinking Water, Aquariums, Hydroponics

3 in 1 PH Meter with TDS/Temp Meter, TDS Water Tester ±0.05 PH High Accuracy with 0-14 PH Measurement Range for Drinking Water, Aquarium, Hydroponics

3 in 1 TDS EC Temperature Meter Pen, Digital Water Tester Kit PPM EC Meter for Drinking Water Hydroponics Aquarium RO System and Pool

AERO-GRO Digital 4-in-1 Water Quality Testing Kit – High Accuracy Digital pH/TDS/EC/Temp Pen Set Perfect for Hydroponics, Pools, Koi Ponds, Drinking Water, Wine/Beer Making, Hot Tub, Spa, Aquarium

Apera GroStar Series GS4 pH/EC/500ppm/700ppm Combo 5-in-1 Pen Tester Kit (Gen II) with Replaceable Double-Junction pH/EC Probe for Hydroponics Water Quality Testing

APERA INSTRUMENTS AI209-T Value Series PH20 pH Tester Combo Kit, including the Maintenance Set, and a CalPod Solution Holder for Easy Calibration

Apera Instruments AI311 Premium Series PH60 Waterproof pH Pocket Tester Kit, Replaceable Probe, ±0.01 pH Accuracy

Atlas Scientific pH Down Two Pack 250ml (16oz Total)

Atlas Scientific pH Up 3 Liter Box

Atlas Scientific pH Up and Down 250ml (8oz)

Banger Labs Premium pH Up Solution

Banger Labs Premium pH up Solution 1 Quart

Black Magic pH Down – Premium Buffer to Lower Nutrient Solution pH, Concentrated Acidic Formula, 8 fl. oz.

Black Magic pH Up – Premium Buffer to Raise Nutrient Solution pH, Concentrated Base Formula, 8 fl. oz.

Bloom City Professional pH Up + Down Control Kit for Optimal Nutrient Uptake (Two 1/2 Pint Bottles) 16 Total oz

Bloom City Professional pH Up Liquid Fertilizer, Quart (32 oz)

Bluelab CONTPHCON pH Controller Connect with Monitoring, Dosing, and Data Logging in Water (Stick not Included) Digital Meter for Hydroponic System and Indoor Plant Grow, White

Bluelab CONTPRO Pro Controller for Fully Automated 24/7 Digital Monitor, Dosing, and Data Logging of Hydroponics Reservoir (Base Only, No Pump), includes pH, EC, and temperature probe

Bluelab METCOMPLUS Combo Meter PLUS for pH, Temperature, and Conductivity in Water and Soil with Easy Calibration, Digital Nutrient (TDS) Testing Kit for Hydroponic System and Indoor Plant Grow

Bluelab METPULSE Pulse Meter Water 3-in-1 Moisture/Nutrient (TDS)/Temperature Test Kit for Garden Soil, Coco, and Solution, Ester for Hydroponic System and Indoor Plant Grow, Clear

Bluelab MONGUA Guardian Monitor for pH, Temperature, and Conductivity (TDS) Measurements in Water with Easy Calibration, 3 in 1 Digital Nutrient Meter for Hydroponic System and Indoor Plant Grow White

Bluelab MONGUACON Guardian Monitor Connect for pH, Temperature, and TDS in Water with Data Logging (Connect Stick not Included), Nutrient Meter for Hydroponic System and Indoor Plant Grow White

Bluelab PENGTB Grower’s Toolbox with pH Pen, Conductivity Tester and Probe Care Kit, Easy Calibration, Digital Meters for Hydroponic System and Indoor Plant Grow

Bluelab PENSOILPH Soil pH Pen, Digital Meter and Water Test Kit, Also Used for Coco and Rockwool with Easy Calibration for Hydroponic System and Indoor Plant Grow, Clear

Bluelab PERIPODM3 Peripod M3 for Pro Controller, Dosing for pH and Nutrient, 3 Pumps with Accessories (Pro Controller Sold Separately), Tool for Hydroponic System and Indoor Plant Grow

Bluelab PERIPODM4 Peripod M4 for Pro Controller

bluelab pH Pen-Digital pH Tester – Reliable & Accurate for High Yield Crops – Hand-Held Meter – Measures pH & Temperature in Solutions and Soil Solutions – Optimize Plant Health & Performance,White

Bluelab TRUNV2 Truncheon Nutrient Meter, Digital Conductivity Tester in Water (Scales Include: EC, 500, ppm 700, CF, TDS) Tool for Hydroponic System and Indoor Plant Grow, White

CANNABMALL PH Meter, TDS PPM Meter and 3 in 1 Soil Moisture Meter Combo

CIZTADA Smart PH Tester for Water Hydroponics Digital PH EC TDS Meter with ATC High Accuracy Multi-Functional Water Tester for Indoor Plant Grow, DWC, Wine, Pools& Spas and Aquariums

Digital PH Meter for Water, 0.01PH High Accuracy Pen Type PH Tester for Hydroponics, Household Drinking, Pool and Aquarium

Digital Water pH Meter, Dr.meter 0.01 Resolution High Accuracy PH Testing Pen with Backlit and Data Hold, 0-14pH Measurement Range Water Quality Tester for Hydroponics, Pool, Aquarium, Brewing

FOOP pH Up and Down – pH Control Kit | Corrects pH Imbalances, Maximizes Nutrient Absorption, Prevents Sickly Plants | Safe, Fast, and Easy to Use | Works Great in Any Growing Medium (16oz Pair)

Foxfarm Cultivation Nation PH Down – 1 Qt.

FoxFarm Cultivation Nation PH Up Quart

Garden Tutor Soil pH Test Kit (3.5-9 Range) | 100 Soil pH Test Strips

General Hydroponics pH Control Kit for a Balanced Nutrient Solution

General Hydroponics pH Down – 8 Oz

General Hydroponics pH Down Liquid Premium Buffering For Stability, 1-Gallon, Orange

General Hydroponics PH Down Qt. – ACID

General Hydroponics pH Up – 8 Oz

General Hydroponics pH Up Liquid Premium Buffering For pH Stability, 1-Gallon

GuDoQi PH Meter, TDS Meter Combo, Pool Water Test Kit, PH Tester Digital, PPM Meter, 0.01 Resolution TDS PH EC Temperature 4 in 1 Set for Drinking Water, Hydroponics, RO System, Aquarium, Swimming

HM Digital PH-80 pH Meter Waterproof PH80 Tester HydroTester

Humboldts Secret pH Down | Liquid pH Plant Balancer for Soil & Hydroponics Growing System

Indo pH Down Hard Water – Strong Formulation for Hard Water – Helps Maintain Optimum pH Levels (1 L / 32 oz)

MICROBE LIFE HYDROPONICS pH Up Liquid Premium Buffering for pH Stability, Increases pH Levels When Nutrient pH is too Low, 16oz

MICROBE LIFE HYDROPONICS pH Up Liquid Premium Buffering for pH Stability, Increases pH Levels When Nutrient pH is too Low, 32oz

MICROBE Life HYDROPONICS PH21402 pH Control Liquid Premium Buffering for pH Stability, Decreases pH Levels When Nutrient pH is Too High, 16 Ounces

MICROBE Life HYDROPONICS PHPHACP pH Control Kit with pH Up & ph Down Liquid for pH Stability, 16 Ounce Bottles, with 4 Ounce Sample of Premium Photosynthesis Plus Liquid Nutrients

PH and TDS Meter Combo, Tuecota Digital ph Water Tester, 3-in-1 TDS Temperature & EC Meter, Digital Water Tester, Ultrahigh Accuracy Water Quality Tester for Drinking Water, Hydroponics, Aquarium etc

PH Down – (Premium Organic Plant Nutrients & Amendments) Hopwood Farms – YT: Illinois Growers Club

pH Indicator Test Drops, Universal Application (pH 2.0-10.0), 100 Tests| for Drinking Water, Urine, and Saliva | Contains 10 ml Bottle of Solution and 20 ml Screw Top Plastic Bottle

PH Meter for Water Hydroponics Digital PH Tester Pen

PH Meter Tester Kit, Digital PH Meter, 0.01 Resolution

PH Meter, TDS PPM Meter, 3 in 1 Soil PH Tester [Upgraded Version] Moisture Meter Combo, PH/EC Tester Digital Kit for Home Water, Hydroponics, Plants Garden Soil and Aquarium Use

PH Meter, TDS PPM Meter, Soil PH Tester, PH/EC Digital Kit, 3 Pack

pH Meter,Accurate and calibrated pH Tester for Hydroponic System,Pools, Koi Ponds, Drinking Water, Wine/Beer Brewing, Hot Tub, Spa, Aquarium

PH Meter,Water Tester 5 in 1 PH/TDS/Salinity/Temp&EC Meter,PH Meter for Water,IP67 Waterproof PH Pen,PPM Meter with Backlit,Salinity Tester for Saltwater Aquarium,Swimming Pool&Seawater.

PH Tester, TDS PPM Meter, Soil PH Meter 3-in-1 PH/EC Digital Kit – Lab PH Meters, Soil Moisture Tester, TDS and EC Pen Combo for Water, Home, Hydroponics, Plants Garden Soil and Aquarium

Safer Gro SG9920QT Ph Down Lowers Water

Viagrow VGPDD501 Natural pH Down Adjusting Crystals, 1 LB, LB, Green

VIVOSUN Digital PH Meter for Water, 0.05ph High Accuracy Pen Type PH Tester for Hydroponics, Household Drinking, Pool and Aquarium

VIVOSUN pH and TDS Meter Combo, 0.05ph High Accuracy Pen Type pH Meter ± 2% Readout Accuracy 3-in-1 TDS EC Temperature Meter for Hydroponics, Household Drinking, and Aquarium, UL Certified

VIVOSUN PH Meter Digital PH Tester Pen 0.01 High Accuracy Water Quality Tester with 0-14 PH Measurement Range for Hydroponics, Household Drinking, Pool and Aquarium, with ATC, Orange

Wide Range pH Indicator Solution: 30 mL Plus 2 Empty Capped Sample Vials — Includes Easy to Read 0.5 pH Increment Color Chart

Yewhick WiFi Water Quality Monitor with Controller, Online pH TDS Monitor for RO Water System, Zero Water, Hard Water, Hydroponics System Agricultural Irrigation, Support Tuya APP Remote Control

YINMIK Digital pH Meter for Food, pH Probe for Sourdough and Bread Dough, Checking The pH of Fermenting Sausages and Salami, Waterproof pH Tester for Solid and Liquid Soft Soil Sample

YINMIK PH Meter, Digital 4 in 1 PH EC TDS Temp Meter for Hydroponics

YINMIK pH Meter, Digital pH Tester for Hydroponics, pH Temp Meter with Horizontal Display for Pool, Spa, Hot Tub, Indoor Plants, Koi Ponds, Drinking Water, Wine Beer Making, Aquarium, Aquaculture

YINMIK Water PH Meter, 3 in 1 PH TDS Temp Pen Type Tester