Milwaukee MA911B/2 Lab Grade Double Junction pH Electrode with Extended Cable
Milwaukee MA911B/2 Lab Grade Double Junction pH Electrode with Extended Cable

Milwaukee MA911B/2 Lab Grade Double Junction pH Electrode with Extended Cable

Availability: Out Of Stock
Brand: Milwaukee Instruments
DESCRIPTION The Milwaukee MA911B/2 is a lab-grade, gel-filled, double junction pH electrode with an extended 6.6-foot cable....
$46.99
$57.15
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Description

DESCRIPTION

The Milwaukee MA911B/2 is a lab-grade, gel-filled, double junction pH electrode with an extended 6.6-foot cable. Designed for use with Milwaukee pH monitors and controllers including the MC120 PRO, MC122 PRO, MC125 PRO, MC810US MAX, and other Milwaukee instruments requiring a BNC-connected pH electrode.

DESIGN FEATURES

DOUBLE JUNCTION: The double junction design reduces the risk of clogging from fertilizer solutions, organic matter, and other contaminants — extending electrode life and maintaining accuracy in demanding applications.

SPHERICAL GLASS TIP: The spherical glass tip provides the largest possible surface area for faster response times and more stable readings.

RESIN BODY: The tough resin body withstands accidental knocks and protects the glass sensing bulb in grow room and industrial environments.

EXTENDED 6.6-FOOT CABLE: The longer cable provides increased flexibility for placement in deep tanks, sumps, and reservoirs where standard 3.3-foot cables fall short.

CARE AND USE

Storage: Keep the probe hydrated. Store with the cap filled with storage solution MA9015 or calibration buffer — never tap water or DI water. Store upright.

Cleaning: Soak regularly in cleaning solution MA9016 to remove residue from the sensing bulb and reference junction.

Calibration: Calibrate regularly and always after cleaning or extended storage to compensate for probe aging.

SPECIFICATIONS

  • Body: Resin | Reference: Single, Ag/AgCl | Junction: Ceramic, Single
  • Electrolyte: Gel | Range: 0–14 pH | Tip Shape: Sphere
  • Diameter: 0.5 inches | Dimensions: 4.7 / 6.4 inches
  • Operating Temperature: -5 to 70°C (23 to 158°F)
  • Cable length: 6.6 feet | Connection: BNC

Frequently Asked Questions

Q: What Milwaukee monitors and controllers is the MA911B/2 compatible with?
A: The MA911B/2 is the standard replacement electrode for Milwaukee pH monitors and controllers including the MC120 PRO, MC122 PRO, MC125 PRO, MC810US MAX, and other Milwaukee instruments with BNC pH electrode connections. It's also compatible with Milwaukee PRO pH meters that accept BNC probes.

Q: Why does the MA911B/2 have a 6.6-foot cable instead of the standard 3.3-foot?
A: The extended 6.6-foot cable is specifically designed for wall-mounted monitors and controllers where the instrument is mounted above or away from the reservoir or tank being monitored. The extra cable length provides the flexibility to reach deep sumps, large reservoirs, and tanks positioned below or at a distance from the mounted controller.

Q: What is the double junction design and why does it matter?
A: A double junction electrode has two reference junctions instead of one. The outer junction acts as a barrier, preventing sample contamination of the inner reference junction. This significantly reduces clogging risk from fertilizer solutions, proteins, and organic matter — resulting in longer electrode life and more stable readings in hydroponic and agricultural applications.

Q: How do I know when to replace the MA911B/2 electrode?
A: Replace the MA911B/2 when response time becomes noticeably slow, readings drift or are unstable even after calibration, or the electrode fails to calibrate accurately. With proper storage and regular cleaning, lab-grade gel-filled electrodes typically last 12–18 months or longer in continuous monitoring applications.

Q: Where can I buy the Milwaukee MA911B/2 pH electrode?
A: You can purchase the Milwaukee MA911B/2 directly from Seres Ag at seresag.com. Seres Ag is a trusted supplier of professional pH electrodes, hydroponic monitoring equipment, and controlled-environment agriculture supplies. Shop at seresag.com for competitive pricing, fast shipping, and expert support.

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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. 

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