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Testing and Monitoring - pH, EC/TDS, PPM


Dr Greenthumb
Dr Greenthumb

Whether using soil or hydroponics for your gardening, the proper balance of your growing environment can be the life or death of your plants. This area helps with the proper maintenance of:

pH: (chemistry) p(otential of) H(ydrogen)
TDS: total dissolved solids
PPM: parts per million
EC: electrical connectivity

Find meter maintenance solutions here. Find pH adjusters here.

Growco is a trained and certified Bluelab retail and warranty outlet.

We are HAZMAT approved to safely ship all of your PH control needs. We take great care in insuring that your packages will get to you in perfect condition, without leaking or being damaged in any way.


  Bluelab Carry Case 
The Bluelab Carry Case provides a custom fit so you can use and read your Bluelab Meter right from the carrying case. Simply zip it closed and your meter is protected during storage or transport. 
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  Bluelab Combo Meter 
The Bluelab Combo Meter tests conductivity (nutrient), pH levels, and temperature, all in one convenient lightweight unit. 
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  Bluelab pH Meter 
The Bluelab pH Meter is used to accurately measure the pH value of nutrient solution. 
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  Bluelab pH Pen 
The Bluelab pH Pen has been specially developed as an affordable, effective tool for hobby or small scale growers. 
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  Bluelab pH Probe 
The Bluelab pH Probe is used to measure the pH of a solution. 
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  Bluelab PPM Pen 
The Bluelab ppm Pen measures conductivity and temperature to ensure your plants are receiving the proper amounts of nutrients. 
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  Bluelab Soil pH Meter 
The Bluelab Soil pH Meter is a reliable pH meter that provides accurate readings of soil or hydroponics growing media. 
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  Bluelab Soil pH Pen 
The Bluelab Soil pH Pen provides both pH and temperature readings of soil and grow media, an effective tool for hobby or small scale gardeners. 
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  Bluelab Soil pH Probe 
The Bluelab Soil pH Probe serves as original equipment replacement for the Bluelab Soil pH Meter, but can also be attached to the Bluelab Combo Meter. 
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  Bluelab Truncheon - CF, PPM and EC meter 
The Bluelab Truncheon Meter is the best selling hydroponics CF / EC Meter in the world. The Truncheon meter measures EC, CF and PPM scales. 
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  Bluelab® Guardian Monitor 
The Bluelab Guardian Monitor measures all three critical parameters to successful plant growth - pH, conductivity and temperature. 
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  Control Wizard EC Dipstick (previously Nutra-Wand) 
The EC Dipstick is one of the easiest meters to use, providing the 4 most popular scales: EC, CF, 500:1ppm, and 700:1ppm! 
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  Hanna Instruments HI 1285-6 Preamplified pH and EC Probe 
Model HI 1285-6 preamplified pH and EC Probe with CAL CHECK is the replacement probe for the Hanna Instruments HI 9813-6N Portable Meter. 
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  Hanna Instruments HI 9813-6N Portable Meter 
The Hanna Instruments HI 9813-6N pH/EC/TDS/°C Portable Meter is specifically designed for agricultural applications such as hydroponics, greenhouses, farming and nurseries. 
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  Hanna Instruments HI-98103 Checker 1 
Model HI 98103: At the cost of just a few rolls of litmus paper, you can have the industry's best pocket-sized pH tester, made by Hanna Instruments! 
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  Hanna Instruments HI-98106 Champ® pH Tester 
Model HI 98106: The Hanna Instruments Champ pH Tester is an affordable, easy-to-use pH pen that is ready-to-use right out of the box. 
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  Hanna Instruments HI-98128 pHep5 pH/Temperature Tester 
Model HI 98128 (pHep 5): This Hanna Instruments waterproof tester features a dual-level LCD that gauges pH level -2.00 to 16.0, and temperature from 23.0 to 140.0 °F (-5.0 to 60.0 °C). 
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  Hanna Instruments HI-98129 Combo pH/EC/TDS/Temperature Tester 
Model HI 98129: pH/EC/TDS/Temperature tester by Hanna Instruments has a completely waterproof shell that also floats. It offers high accuracy readings with dual-level LCD readout. 
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  Hanna Instruments HI-98311 DIST 5 pocket tester 
Model HI 98311: Hanna Instruments DIST 5 EC/TDS/temperature tester is waterproof. It even floats. Guages temperature from 0.0 to 60.0 °C or 32.0 to 140.0 °F. 
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  Hanna Instruments HI-991404 Combo pH, EC/TDS/Temperature Monitor 
Model HI 991404: A large backlit LCD continuously monitors the three most important nutrient parameters in greenhouse, hydroponics and horticultural applications. 
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  HI 710007 Shockproof Rubber Boot 
The Hanna Instruments HI 710007 Shockproof Rubber Boot is designed to be used with the HI 9813-6(N) portable pH/EC/TDS/temperature meter. 
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  Martini EC59 EC TDS and Temperature meter 
The Milwaukee Instruments Martini EC59 multi pocket tester measures and displays EC TDS and Temperature simultaneously on an easy to ready display. 
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  Martini Mi56P Replaceable Electrode 
The Mi56P replaceable electrode is used with Martini pH55 and pH56 pH / temperature meters. 
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  Martini pH55 Waterproof pH and Temperature meter 
The Milwaukee Instruments Martini pH55 Waterproof pH & Temperature tester has a large display with graphic symbols to help guide you through all operations. 
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  Milwaukee MA73075 TDS probe 
Milwaukee MA73075 Conductivity / TDS Probe is the replacement for model T75 and C65 high range testers. 
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  Milwaukee MW100 pH Meter 
The Milwaukee MW100 portable pH meter replaces the model SM100 and is a no-frills low-cost tool that is ideal for beginners. 
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  Milwaukee pH600 Tester 
The Milwaukee pH600 Tester is an easy-to-use, economical instrument that measures quick and reliable pH values. 
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  Milwaukee Portable 3-in-1 pH/EC/TDC meter 
The Milwaukee MW802 portable 3-in-1 meter allows you to measure pH, EC (conductivity) and TDS with just one instrument using a single probe. (replaces model SM802) 
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  Milwaukee SE220 Electrode 
This is the original equipment from Milwaukee that replaces the pH electrode on model MW100, MW101 and MW102 pH water testers. 
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  Milwaukee SE600 pH/EC/TDS Combination Probe 
The Milwaukee SE600 pH/EC/TDS combination probe is the replacement for both MW801 and MW802 models of combo meters. 
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  Milwaukee Sharp T75 waterproof TDS meter 
Model T75: An easy-to-use waterproof, low-range TDS tester which is ideal for hydroponics gardening. 
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  Nutradip Trimeter - pH, TDS and temperature meter 
When you need continuous reservoir readouts of pH, TDS and temperature, the Nutradip Trimeter is your solution. 
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  Nutradip Trimeter Probe 
This original equipment replacement probe fits the Nutradip tri-meter. 
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  Oakton® Multiparameter PCS Testr 35 
The waterproof Oakton Multiparameter PCS Testr 35 is a pocket-sized meter used for pH, TDS and temperature readings. 
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  Oakton® Waterproof EcoTestr™ pH 2 
The EcoTestr™ pH 2 has an easy-to-read display and its ergonomically designed LC display allows you to read measurements in a glance. 
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  Rapitest Digital Soil pH Meter 
The Rapitest Digital Soil pH Meter is an easy-to-use soil pH tester that determines soil acidity and alkalinity. 
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  Rapitest Soil pH Meter with probe 
Ideal for testing soil pH levels of your indoor potted plants or outdoor garden areas. The Rapitest Soil pH Meter measures pH levels from 3.9 to 9.0. 
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  Sunleaves Digital 4-Way Soil Meter 
The Sunleaves Digital 4-Way Soil Meter is a great tool for outdoor gardeners or indoor gardeners growing plants potted in soil. 
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  Sunleaves pH Expert Plus Meter 
With the Sunleaves pH Expert Plus, measuring the pH in your reservoir is a snap! This handheld waterproof pH meter automatically compensates for the temperature of your nutrient solution to give you an extremely accurate reading. 
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  Sunleaves Soil pH Tester 
Monitor soil pH on a scale of 4 to 8 with the durable, easy-to-read Sunleaves Soil pH Tester. 
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  Sunleaves SPEP505 pH Probe 
This is original equipment for the Sunleaves pH Expert Plus. 
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  Sunleaves STEP505 TDS Probe 
The STEP505 replacement probe is the same high-quality component that ships with the Sunleaves TDS Expert Plus. 
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  Sunleaves TDS Essential Digital Pen 
Measures nutrients levels from 0-9990 ppm with accuracy to ± 0.2%. 
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  Sunleaves TDS Expert Plus Meter 
The Sunleaves TDS Expert Plus is a highly-advanced handheld meter that measures nutrient solution electrical conductivity (EC), total dissolved solids (TDS), and liquid temperatures. 
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  Sunleaves Three-Way Meter 
Conveniently test the moisture, light, and pH levels of your plants with the Sunleaves Three-Way Meter. 
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Growco Indoor Garden Supply
1042 Michigan NE  ·  Grand Rapids, Michigan USA  49503-1908
phone: (616) 454-6900  ·  toll free: 877-939-6900
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