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

$59.76

pH Up and pH Down Control Kit — 250 mL (8.4 fl oz) Each — Achieve The Perfect pH — Great for Hydroponics

$19.65

General Hydroponics pH Control Kit for a Balanced Nutrient Solution

$17.26

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

$86.13

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

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

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

100 Soil pH Test Kit, 0-14 PH Test Strips, Fast and Accurate Soil Testing Paper, Soil Acidity Detector Plant Care Tool, for Indoor Outdoor Garden Lawn Farm

$30.99

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

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

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

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

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

$14.84

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

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

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

Garden Tutor Soil pH Test Kit (3.5-9 Range) | 100 Soil pH Tester Strips - Test Soil Acidity and Alkalinity of Garden Lawn Grass Flower Vegetable Compost Indoor and Outdoor Plants

$29.99

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 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

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

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

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

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

100pcs Soil Test Strips, Soil pH Test Kit (3.5-9 Range), Quickly pH Testing for Garden Home Lawn Grass Vegetable Gardening Dirt Outdoor and Indoor Plants

$4.5

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

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

100 Strip Soil pH Test Kit - Complete pH Test Checker - Professional Tester for Accurate Results in Gardens, Lawns, Grass, and Vegetable - Essential Gardening Tool

$31.95

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

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

$16

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

$17.99

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

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

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

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

PooTe Soil pH Test Kit - 100 Strips 2-in-1 Soil Testing Kit (3.5-9 Range) with Plastic Tube - Professional Tester Soil Nitrogen & pH for Garden Home Lawn Grass Yard

$20.29

Nynelly 15 Pack pH Meter Buffer Solution Powder pH 6.86, 4.01, 9.18 for Precise Calibrate pH Meter, pH Calibration Powder Solution, pH Tester Calibration Powder Packets

$22

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

$7.99

Digital pH Meter, pH Meter for Water, 0-14 pH Measurement Range pH Tester, 0.01 High Precision Water Quality Tester with ATC for Drinking Water Pool

$29.99

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

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

XLUX Soil pH Tester, Acidity Test Meter, Strips Kit 200 Tests, for Garden Home Lawn Farm Vegetable Yard Compost Outdoor and Indoor Plants, 4.5-9.0 Range

$21.16

TAEING Soil pH Test Strips (3-9 Range),100pcs Soil Test Reagents Strips Test Indicator Measuring Test Paper Kit for Garden Lawn Farm Plants Home Garden Decor

$15.89

GISNPA PH Meter, 5 in 1 pH/TDS/EC/Salinity/Temp Meter, Waterproof Pool Salt Tester, 0.01 Resolution High Accuracy Water Tester for Drinking Water, Hydroponics, Saltwater Pool, Aquarium, Koi Fish Pond

$91.96

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

$14.95

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

$6.99

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

$15.97

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

$16.9

Apera Instruments AI102G GroStar Series GS2 Soil pH Pen Tester Kit for Direct Soil Test and Nutrient Solutions Test with Replaceable Swiss Spear pH Probe, Gen II

$9.99

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

$15.99

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

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

$34.99

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

$38.88

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

$95.24

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

GISNPA Digital pH Meter for Food, 0.01 Resolution High Accuracy Food pH Tester with Backlit LCD Display and ATC for Meat, Bread, Canning, Brewing, Cheese, Solid Sampling, Soft Soil and Water

$11.99

Luster Leaf 1601 Rapitest Test Kit for Soil pH, Nitrogen, Phosphorous and Potash, 2 Pack

$29.95