Milwaukee MC125 PRO 2-in-1 Digital pH / ORP Controller
Milwaukee MC125 PRO 2-in-1 Digital pH / ORP Controller
Milwaukee MC125 PRO 2-in-1 Digital pH / ORP Controller
Milwaukee MC125 PRO 2-in-1 Digital pH / ORP Controller

Milwaukee MC125 PRO 2-in-1 Digital pH / ORP Controller

Availability: In Stock
Brand: Milwaukee Instruments
DESCRIPTION The Milwaukee MC125 PRO pH and ORP controller is designed for people looking to measure and...
$264.99
$264.99
Subtotal: $264.99

Lead Time

this products ships in 1-2 days

  • Seres
Description

DESCRIPTION

The Milwaukee MC125 PRO pH and ORP controller is designed for people looking to measure and automatically adjust pH and ORP levels with one simple controller. Just set your pH and ORP parameters and let the Milwaukee controller do the rest. Popular for nutrient tanks, aquariums, pools, and spas.

ACCURACY

Accuracy to ±0.2 pH with two-point manual calibration and ORP accuracy to ±5 mV.

REAL-TIME MONITORING

See real-time pH (0.00–14.00) and ORP (-1000 mV to +1000 mV) on a large LED display with easy switching between parameters.

AUTOMATION FOR CONSTANT MEASUREMENT

Control range: 4 to 8 pH and -200 to +600 mV. Set your control range and let the controller manage dosing automatically.

TWO DEDICATED RELAYS FOR pH AND ORP CONTROL

Choose compatible devices — oxygen pumps, CO2 regulators, O3 ozonizers, and other pH/ORP control devices — by simply plugging into the correct pH or ORP outlet.

EASY INSTALLATION

Comes with a complete mounting kit including two probe holders. 6.5-foot probe cables for extra flexibility.

DESIGN FEATURES

  • Accurate to ±0.2 pH and ±5 mV with user-selectable high/low set points.
  • Simple two-point calibration for pH with manual trimmers.
  • Lab-grade, gel-filled, double junction pH electrode and platinum ORP electrode included.
  • 6.5-foot probe cables for flexible placement.
  • 12 VDC power supply included.

SPECIFICATIONS

  • pH Range: 0.00–14.00 pH | ORP Range: ±1000 mV
  • pH Resolution: 0.01 pH | ORP Resolution: ±1 mV
  • pH Accuracy: ±0.2 pH | ORP Accuracy: ±5 mV
  • Set point pH: 4 to 8 pH | Set point ORP: -200 to 600 mV
  • Calibration: Manual 2-point pH
  • pH Electrode: MA911B/2 (included) | ORP Electrode: MA921B/2 (included)
  • Power Supply: 12 VDC adapter (included)
  • Power Drivers: 115 VAC, 2A, 60Hz or 230 VAC, 1A, 50Hz
  • Environment: 0 to 50°C / 32 to 122°F; max RH 95%
  • Dimensions: 5.8 x 3.25 x 1.26 inches | Weight: 7.1 ounces

Frequently Asked Questions

Q: What is the Milwaukee MC125 PRO and how does it automate pH and ORP control?
A: The MC125 PRO is a 2-in-1 continuous pH and ORP controller with two dedicated relay outputs. You set your desired pH and ORP set points, and the controller automatically activates connected dosing devices — such as CO2 regulators for pH down or ozonizers for ORP up — whenever readings drift outside your target range. This eliminates manual dosing and keeps water chemistry stable 24/7 in nutrient tanks, aquariums, pools, and spas.

Q: What devices can I connect to the MC125 PRO relay outputs?
A: The MC125 PRO has two independent relay outlets — one for pH dosing and one for ORP dosing. Compatible devices include CO2 regulators, peristaltic dosing pumps, oxygen pumps, O3 ozonizers, and other pH/ORP control equipment. Simply plug the device into the appropriate outlet and the controller handles activation automatically based on your set points.

Q: How accurate is the MC125 PRO and what probes does it include?
A: The MC125 PRO delivers ±0.2 pH accuracy and ±5 mV ORP accuracy. It includes the MA911B/2 lab-grade double junction gel-filled pH electrode and the MA921B/2 platinum ORP electrode — both with 6.5-foot cables for flexible probe placement. Two-point manual calibration ensures pH accuracy is maintained over time.

Q: How do I maintain the pH and ORP probes on the MC125 PRO?
A: For the pH probe: store with the cap filled with buffer or storage solution (never water), clean regularly by soaking in cleaning solution, and recalibrate after cleaning or storage. For the ORP probe: store similarly, clean to remove platinum electrode residue, and recalibrate periodically. Proper maintenance significantly extends probe life and measurement accuracy.

Q: Where can I buy the Milwaukee MC125 PRO pH and ORP controller?
A: You can purchase the Milwaukee MC125 PRO directly from Seres Ag at seresag.com. Seres Ag is a trusted supplier of professional pH/ORP controllers, hydroponic automation equipment, and controlled-environment agriculture supplies. Shop at seresag.com for competitive pricing, fast shipping, and expert support.

Shipping & Returns
We ship daily from Monday through Friday, and shipments are processed within 24-48 hours of cleared payment.
Orders placed over the weekend are processed on the next business day.

Free Shipping

Specific Vendors offer free shipping over a certain amount. This will be automatically applied during checkout.

Orders over $10,000 before tax qualify for free shipping!

Free Shipping only applies to domestic US (lower 48 states -- sorry, Alaska & Hawaii) shipments.

Shipping Rates

Shipping rates are calculated during checkout based on the weight, dimensions, and destination of the ordered items. We do our best to calculate the exact cost.

Updated 5/1/2023:

Please note that due to the higher shipping costs and larger dimensions of some of our products, our shipping calculator may not always provide an accurate shipping estimate. In these cases, we will reach out to you with an updated shipping quote after you place your order. If you have any questions about shipping costs, please don't hesitate to contact us before placing your order. We apologize for any inconvenience and appreciate your understanding.

Seres reserves the right to notify you of any additional shipping charges. We partner with multiple vendors and locations, which can alter shipping rates. In addition, there are conditions out of our control (rural areas, fuel surcharge, multiple shipments). If this occurs, you will be contacted immediately and have the right to modify or cancel your order for a full refund. 

Address Change / Order Cancellation

If you need to change the shipping address, please get in touch with us at support@seresag.com or call 1-877-237-3754. 

Once the order is shipped, we will do our best to perform an address intercept. You will be charged an Intercept Fee imposed by the shipping carrier. This fee varies from each carrier. Please note not all shipping carriers will accept address intercept changes.

If an order is canceled in transit, you are solely responsible for all shipping charges incurred by the Shipping Carrier.

Shipping charges will not be refunded.

Tracking

Once an order has been shipped, we will send an email and text message on file with the tracking number. If your order is fulfilled from multiple vendors or locations, you will receive shipment confirmations with tracking for each shipment. 

In addition, you can check the status of your order through the order confirmation email or within your profile page under Track Order.

Freight (LTL)

Scheduled appointments deliver freight shipments. You are responsible for inspecting for damage incurred in transit and signing before the driver leaves. DO NOT accept the shipment if there is any damage. If your freight shipment arrives damaged, contact us immediately.

Once delivered, we cannot reimburse paid freight charges or refund products.

Some restrictions may apply; Hawaii and Alaska do not qualify for free shipping offers.

Damaged Shipment

It rarely happens, but once in a while, products are damaged during Shipping. Therefore, please scrutinize all shipments for damaged or missing items before signing for them (if required).

The shipping carrier is responsible for items damaged during Shipping, which will most often be UPS, FedEx, or USPS. 

If assistance is needed, please get in touch with us immediately. Seres cannot promise refunds or replacements if this is not done within 72 hours. 

By signing your name and accepting shipment for a Freight(LTL) order, you get no reimbursement of freight charges, order costs, or any other charges incurred.

Lead Times

Please note that there is up to a 7-day processing period for orders containing Hawthorne products.

Signature

Due to the valuable contents of many products we sell,  the carrier may need a signature upon delivery. Please understand that this is a measure our company took to ensure safe delivery and fraud protection.

Third-Party Carriers will attempt to deliver a signature-required order three times. 

Please follow up with the carrier for assistance if a missed-delivery note is received.

If assistance is needed, please get in touch with us, so we can help contact the carrier. 

Shipping costs will not be refunded for missed shipments.


Seres is not responsible for any missing, lost, or stolen items.
 

At this time, we do not ship to post office boxes or APO/FPO addresses.  

For more information, please read our Terms of Service.

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