Standard Hydroponics pH Up and Down Kit - 10 Ounce Bottle pH Adjuster for Hydroponic Systems, Coco Coir Even Soil.

$59.76

General Hydroponics pH Control Kit for a Balanced Nutrient Solution

$17.26

FOLLOWIN pH Up and Down Control Kit (9oz+9oz), Hydroponics pH Tester Calibration Adjuster Buffer Solution Combo for Soil Gardening Plants Pool A Balanced Nutrient

$3.84

Microbe Life Hydroponics pH Down pH Control Liquid, Premium Buffering for pH Stability, Decreases pH Levels, Use with Any Feeding Systems Including Hydroponics or Soil, 16 Ounces

$25.34

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

$16

GH General Hydroponics pH Up and pH Down 1 Quart Combo Kit Water Adjuster Buffer

$86.13

General Hydroponics pH Test Indicator 8 oz Ounces - up Down Wide Spectrum

$38.88

AC Infinity pH Meter PRO Kit, High Precision Digital pH Pen with ±0.01 pH Accuracy and Interchangeable Probe, Nutrient Test pH Meter for Water Hydroponics Plants, Gardening, Aquariums, Swimming Pools

$19.99

PINPOINT® High-Precision pH Calibration Fluids Kit (pH Buffer Solution), 12 Piece Set - pH 4.000, 7.000, 10.000

$23

PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium

$22.99

Banger Labs Premium pH Up Solution - Corrects pH Imbalances, Maximizes Nutrient Absorption, Prevents Sickly Plants | Plant pH Adjustment, pH Levels Optimizer | Safe, Fast, and Easy to Use (1 Quart)

$78

Pinpoint® High-Precision pH Calibration Fluids Kit (pH Buffer Solution), 10 Piece Set - 4.000, 7.000

$23

Pinpoint® High-Precision pH Calibration Fluids Kit (pH Buffer Solution), 10 Piece Set - 7.000, 10.000

$23.5

pH Buffer Calibration Solution 3-Pack — 1 Gallon Each: pH 4.00, pH 7.00 and pH 10.00 — NIST Traceable Reference Standards for All pH Meters

$69

pH Buffer Calibration Kit 2-Pack — 250 mL (8.4 fl oz) Bottle of Each: pH 4.00 and pH 7.00 | Color Coded

$14.99

pH Buffer Calibration Solution 2-Pack — 1 Gallon Each: pH 4.00 and pH 7.00 — NIST Traceable Reference Standards for All pH Meters

$23

pH Buffer Calibration Solution 2-Pack — 1 Gallon Each: pH 7.00 and pH 10.00 — NIST Traceable Reference Standards for All pH Meters

$23.5

pH Buffer Calibration Solution Kit 2-Pack — one pH 4.00 (red) and one pH 7.00 (Yellow), Each 250 mL (8.4 fl oz) — NIST Traceable Reference Standards for All pH Meters

$23

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

$19.9

pH Buffer Calibration Kit: 2×250-mL (8.4 fl oz) Bottles, one pH 7.00 and one pH 10.00 — NIST Traceable Reference Standards

$39

pH Buffer Calibration Solution Kit 2-Pack — one pH 4.00 (red) and one pH 7.00 (Yellow), Each 500 mL (1.06 Pint) — NIST Traceable Reference Standards for All pH Meters

$25.99

pH Buffer Calibration Kit 3-Pack: 250 mL (8.4 fl oz) Each of pH 4.00, pH 6.86, and pH 9.18 — NIST Traceable Reference Standards for All pH Meters

$39

pH Buffer Calibration Solution Kit 3-Pack: pH 4.00, pH 7.00, pH 10.00 Buffers — 250 ml (8.4 fl oz) Each — Color Coded — NIST Traceable for All pH Meters

$19.98

Bluelab pH 4.0 & 7.0 Calibration Solution Kit - pH Meter & pH Pen Calibration for Balanced Nutrient Solution NIST Certified | Hydroponics, Gardening & Growing Tents (500 ml/ 16.9 Fl Oz Each)

$8.99

pH Buffer Solution Powder for pH Meter Calibration | 30 Packs, 10 Packets Each of pH 4.00, 6.86, 9.18

$17.99

15-Pack pH Meter Buffer Solution Powder for Precise and Easy PH Calibration, PH Calibration Powder Solution 6.86,4.01,9.18

$21.99

pH Buffer Calibration Solution Kit 3-Pack: pH 4.00, pH 7.00, pH 10.00 Buffers — 500 mL (1.06 Pint) Each — Color Coded — NIST Traceable for All pH Meters

$23

BOJACK 15 Pack of pH Meter Buffer Solution Powder for Precise and Easy PH Calibration, PH Calibration Powder Solution 4.01pH,6.86pH and 9.18pH

$30.5

DuvinDD 18 Pack pH Meter Buffer Solution Powder 6.86/4.00/9.18, pH Calibration Solution Packets for Precise PH Meter

$14.84

Bluelab CAREKITPH pH Probe Care Kit with Calibration Supplies, Storage Solution, and Brush, Used for Pen, Meter, Monitor, Controller and Tools for Hydroponic System and Indoor Plant Grow, Clear

$16.9

Innovating Science pH Calibration Solution 4.00, 7.00, 10.00 & pH Electrode Storage Solution, 500ml - 16.9oz (Pack of 4) - Premium pH Buffer Solution Kit

$14.95

YINMIK pH Meter Calibration Solution Kit(4.00,7.00&10.01) with pH Protective Solution Kit,3 Bottles 50ml pH Calibration Buffer Solution and 2 bottels 10ml KCL pH Probe Solution for pH Meters

$7.99

2 in 1 Temperature pH Monitor Meter Tester Sensor Test Kit 0~14 pH Automatic Calibration BNC Electrode Probe for Hydroponic ph Aquarium Meter Water Lab Food Drinking Water pH of Saltwater/Seawater

$19.99

CANNABMALL PH Meter, TDS PPM Meter and 3 in 1 Soil Moisture Meter Combo, High Accuracy Lab PH/EC Tester Digital Kit [Upgraded] for Home Water, Hydroponics, Plants Garden Soil and Aquarium PH Pen

$22.79

API PH TEST KIT 250-Test Freshwater Aquarium Water pH Test Kit, 4 Piece Set

$15.97

Apera Instruments AI1113 pH Calibration Buffer Solution Kit (7.00, 4.00), 8 oz. Each

$7.99

MICROBE LIFE HYDROPONICS PH21363 Premium All-In-One Nutrient for Plant Growth and Better Yields, 16oz

$38.88

Bluelab STSOL120 KCL Storage Solution 120ml pH Probe and Pen, Maintain Meters Used for Water, Soil, and Hydroponic System or Indoor Plant Grow White

$9.99

pH Buffer Calibration Solution, pH 7.00 — 1 Gallon — NIST Traceable Reference Standards for All pH Meters — Color Coded Yellow

$14.95

Alkaline Water (ph Test Kit) for Drinking Water Measures pH Level of Water More Accurately Than Test Strips pH Starter Kit Drops Easy to Use

$12.98

APERA INSTRUMENTS AI1116 pH Calibration Solution Kit (7.00, 4.00, 10.01), 16 oz. Each, Plus a CalPod Solution Holder for Easy Calibration, NIST traceable

$7.96

GISNPA 7 in 1 pH/TDS/EC/ORP/S.G/Salinity/Temp Meter with ATC pH Tester, 0.01 Resolution High Accuracy Digital pH Meter, Water Tester for Drinking, Hydroponics, Swimming Pool and Aquarium

$29.95

YINMIK 15 Pack PH Calibration Powder, 5 Each for PH 4.00, PH 7.00 and PH 10.01 Calibration Buffer Powder, PH Tester Calibration Packets for PH Meters

$14.95

Nynelly 15pcs pH Meter Buffer Solution Powder for Precise and Easy for Precise pH Calibration Powder Solution 4.00,6.86,9.18

$23.5

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

$159.5

pH Buffer Calibration Solution Kit 4-Pack — 250 mL (8.4 fl oz) Each: pH 4.00 Buffer, pH 7.00 Buffer, pH 10.00 Buffer, and Electrode Storage Solution — NIST Traceable Reference Standards

$39

Nynelly Only 6.86,15pcs pH Meter Buffer Solution Powder for Precise and Easy for Precise pH Calibration Powder Solution

$15.99

pH Buffer Calibration Solution, pH 10.00 — 1 Quart (950 mL) — NIST Traceable Reference Standards for All pH Meters — Color Coded Blue

$6.99

UIUZMAR Digital pH Meter pH TDS EC Meter for Hydroponic Nutrient Solution pH and EC Meter with LCD Display TDS Water Tester pH PPM Meter for DWC Setup Aeroponic Growing Tent Indoor Plant Grow

$22.79

APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy

$29.99

pH Buffer Calibration Solution, pH 4.00 — 1 Quart (950 mL) — NIST Traceable Reference Standards for All pH Meters | Color Coded Red

$34.99

Apera Instruments AI104G GroStar Series GS4 pH/EC/500ppm/700ppm Combo 5-in-1 Pen Tester Kit with Replaceable Double-Junction pH/EC Probe for Hydroponics Water Quality Testing, Gen II

$42.69

pH Buffer Calibration Solution 3-Pack: pH 4.00 Buffer, pH 7.00 Buffer, and Electrode Storage Solution — 250 mL (8.4 fl oz) Each — NIST Traceable Reference Standards for All pH Meters

$7.96

4x20ml, pH 4 + 4 + 7 + 7 Milwaukee Buffer Solution, for Digital pH Meter Calibration

$16.99

In The Swim pH Increaser for Pools - Granular 100% Sodium Carbonate (Soda Ash) to Raise pH Up - 45 Pounds

$49.95

Bluelab PROBPH pH Probe for Water, Replacement Electrode for Meter, Monitor, and Controller with Easy Calibration, Tool for Hydroponic System and Indoor Plant Grow

$88.39

Green Gobbler pH Down | Pool & Hot Tub Spa pH Reducer | pH decreaser | Sodium Bisulfate | 25 lb Pail

$39.99

In The Swim pH Increaser for Pools - Granular 100% Sodium Carbonate (Soda Ash) to Raise pH Up - 25 Pounds

$24.48

Apera Instruments, LLC-AI1109 8oz. pH Calibration Buffer Solution Kit (pH 4.00, 7.00 & 10.01), plus 4oz 3M KCL Storage Solution for pH/ORP Electrodes

$8.99

General Hydroponics CALiMAGic for Gardening, 2.5-Gallon

$16.9