--- product_id: 7709657 title: "Milwaukee Instruments MC122 pH Controller" brand: "milwaukee instruments" price: "$455.87" currency: USD in_stock: true reviews_count: 12 category: "Milwaukee Instruments" url: https://www.desertcart.us/products/7709657-milwaukee-instruments-mc122-ph-controller store_origin: US region: United States of America --- # 12V DC power adapter for reliable operation 0.2 pH accuracy for precise monitoring LED visual alarm for instant alerts Milwaukee Instruments MC122 pH Controller **Brand:** milwaukee instruments **Price:** $455.87 **Availability:** ✅ In Stock ## Summary > 🌿 Master your ecosystem with precision pH control—because your green space deserves the best! ## Quick Answers - **What is this?** Milwaukee Instruments MC122 pH Controller by milwaukee instruments - **How much does it cost?** $455.87 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/7709657-milwaukee-instruments-mc122-ph-controller) ## Best For - milwaukee instruments enthusiasts ## Why This Product - Trusted milwaukee instruments brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Plug & Play Setup:** Comes fully assembled with probe, calibration solution, and mounting kit—get started in minutes, no hassle. - • **Smart Alarm System:** LED alerts activate dosing pumps automatically when pH drifts beyond your set range—never miss a critical shift. - • **Precision pH Control:** Maintain perfect pH balance with ±0.2 accuracy—your plants and aquatic life deserve it. - • **Real-Time Monitoring:** Continuous pH readings with easy manual calibration keep you in control and ahead of any fluctuations. - • **Hydro & Aquarium Ready:** Engineered specifically for hydroponics and aquariums, ensuring optimal growth environments 24/7. ## Overview The Milwaukee Instruments MC122 pH Controller is a professional-grade device designed for hydroponic systems and aquariums, offering precise pH monitoring from 0.0 to 14.0 with ±0.2 accuracy. It features a user-selectable LED alarm and dosing control socket to automate pH adjustments, comes with a double junction pH probe, calibration solution, and mounting accessories, and operates on a reliable 12V DC power adapter for seamless integration into your setup. ## Description Professional pH controller especially designed for use with hydroponic systems and aquariums. Range: 0.0 to 14.0, 2 point manual calibration and Accuracy: 0.2 pH. Set Point Range: 5.5 to 9.5 pH, LED visual alarm active & power plug socket for dosing turned on when reading is higher or lower (user select) than the set point. Supplied with 12V DC power adapter, MA911B/2 double junction pH probe, 20 ml pH 7.01 calibration solution and screwdriver for calibration. Unit comes with mounting kit and probe holder. Review: Works like a charm. - This works extremely well on for controlling my CO2 injection on my 120g planted tank. It was easy to calibrate and install and is giving accurate readings so far after 1 week. This product gives real-time readings and has eliminated pH testing and that in its self is worth it to me. I have a timer plugged into the outlet that the unit controls. In my opinion, buying a timer with this is a must. It allows me to leave the product on 24 hours per day while letting the timer control the flow of CO2. I am able to monitor the pH at all times and evaluate the pH swings with CO2 injection. Currently, the pH is 6.8 in the AM before the CO2 comes on and it drops to 6.6 by the end of the time I have the CO2 set to be on. Works like a charm. Review: Easy to set up and works as expected - This is the first PH monitor I've used and so far seems to be accurate. The label marks for the PH dial setting are a bit off. Only took about three tests to get my settings where I want them. One thing, it failed to trigger my CO2 twice while I had it plugged in directly to the controller. Inserting a power strip between the controller and the CO2 seems to have fixed this. Not sure if it's the CO2 or the PH monitor. ## Features - Professional Ph Controller Especially Designed For Use With Hydroponic Systems And Aquariums - 5 Ph, Led Visual Alarm Active & Power Plug Socket For Dosing Turned On When Reading Is Higher Or Lower (User Select) Than The Set Point - Supplied With 12V Dc Power Adapter, Ma911B/2 Double Junction Ph Probe, 20 Ml Ph 7 - No Assembly Required ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00I47XIX2 | | Best Sellers Rank | #494,933 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #447 in Lab pH Meters | | Brand | Milwaukee Instruments | | Brand Name | Milwaukee Instruments | | Customer Reviews | 4.4 out of 5 stars 183 Reviews | | Display Type | LED | | Global Trade Identification Number | 00810666004225 | | Item Type Name | ph controller | | Item Weight | 1.9 pounds | | Manufacturer | Milwaukee Instruments | | Material | Plastic | | Material Type | Plastic | | Model | 716690 | | Number of Items | 1 | | Number of Packs | 1 | | Part Number | 716690 | | UPC | 810666004225 | | Unit Count | 1 Count | ## Images ![Milwaukee Instruments MC122 pH Controller - Image 1](https://m.media-amazon.com/images/I/81rUzCAI1+L.jpg) ![Milwaukee Instruments MC122 pH Controller - Image 2](https://m.media-amazon.com/images/I/515lun8XS5L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works like a charm. *by A***H on March 19, 2017* This works extremely well on for controlling my CO2 injection on my 120g planted tank. It was easy to calibrate and install and is giving accurate readings so far after 1 week. This product gives real-time readings and has eliminated pH testing and that in its self is worth it to me. I have a timer plugged into the outlet that the unit controls. In my opinion, buying a timer with this is a must. It allows me to leave the product on 24 hours per day while letting the timer control the flow of CO2. I am able to monitor the pH at all times and evaluate the pH swings with CO2 injection. Currently, the pH is 6.8 in the AM before the CO2 comes on and it drops to 6.6 by the end of the time I have the CO2 set to be on. Works like a charm. ### ⭐⭐⭐⭐⭐ Easy to set up and works as expected *by J***T on September 6, 2016* This is the first PH monitor I've used and so far seems to be accurate. The label marks for the PH dial setting are a bit off. Only took about three tests to get my settings where I want them. One thing, it failed to trigger my CO2 twice while I had it plugged in directly to the controller. Inserting a power strip between the controller and the CO2 seems to have fixed this. Not sure if it's the CO2 or the PH monitor. ### ⭐⭐⭐⭐ Missing some optional solutions but works great so far. *by D***E on July 14, 2020* Only 1 set of packages for calibration supplied (as per photo in ad), but no Electrode Rinsing Solution or Electrode storage solution. These are optional, so plan to spend more for the solutions required for calibration, initial use, storage, or DIY. I interfaced this controller with the Milwaukee MP 810 dosing pump, bought separately. Recommend buying the unit together for about $2.15. I calibrated the electrode, which was spot on out of the box, gave it a test run. Pump delivers 60cc/3 min. I put the pH probe, and PH solution delivery tube from the pump in my 45 gal hydroponic garden's reservoir. I diluted pH DOWN solution 1/4 cup/gallon of water, and put the intake tube and filter (float?) provided with the pump in the diluted pH down solution. Set the dial on the controller to about pH 5.9, and put the toggle on Below. Setup this way, the controller will activate the pump to deliver acid to the reservoir to keep the pH below 5.9. The pH was above 6, and the pump immediately activated and pumped a couple of ounces of the acid solution into the reservoir, then stopped. Unit is on and will monitor pH and deliver enough acid solution to counteract the tendency of pH to rise as plants use up acid nutrients. What a relief! No more tedious pH checks and estimated additions of acid to keep pH in desired growth range of 5.5-5.9 for the heirloom tomatoes I am growing indoors. ## Frequently Bought Together - Milwaukee 716690 ph Controller - Gikfun 12V Adjustable Peristaltic Dosing Pump Liquid Metering Pump with Adapter for Aquarium Lab Analytical EK1960 - Gikfun 9.84 Ft 3m Silicone Tube 2mm ID x 4mm OD Flexible Silicone Rubber Tubing Water Air Hose Pipe Transparent for DIY Peristaltic Pump Transfer EK1962 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/7709657-milwaukee-instruments-mc122-ph-controller](https://www.desertcart.us/products/7709657-milwaukee-instruments-mc122-ph-controller) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-10-06*