Milwaukee Instruments EC40 PRO EC/TDS Nutrient Meter
Milwaukee Instruments EC40 PRO EC/TDS Nutrient Meter
Milwaukee Instruments EC40 PRO EC/TDS Nutrient Meter
Milwaukee Instruments EC40 PRO EC/TDS Nutrient Meter
Milwaukee Instruments EC40 PRO EC/TDS Nutrient Meter
Milwaukee Instruments EC40 PRO EC/TDS Nutrient Meter
Milwaukee Instruments EC40 PRO EC/TDS Nutrient Meter
Milwaukee Instruments EC40 PRO EC/TDS Nutrient Meter

Milwaukee Instruments EC40 PRO EC/TDS Nutrient Meter

Availability: In Stock
Brand: Milwaukee Instruments
Milwaukee EC40 PRO EC/TDS Nutrient Meter The Milwaukee EC40 PRO is an extremely tough, reliable, IP67 waterproof...
$70.89
$85.07
$70.89
Subtotal: $70.89

Lead Time

this products ships in 1-2 days

  • Seres
Description

Milwaukee EC40 PRO EC/TDS Nutrient Meter

The Milwaukee EC40 PRO is an extremely tough, reliable, IP67 waterproof nutrient meter designed for hydroponic, horticulture, and agricultural applications. Factory calibrated — no user calibration ever required. Twenty (20) blue LEDs make readings easy to see in daylight or darkness. Powered by 3 AA batteries with up to 3 years of battery life at 10 measurements per day.

FEATURES

  • Measures EC, TDS, and CF simultaneously.
  • Units directly in mS/cm, CF, and PPM — no conversions needed.
  • Automatic Temperature Compensation (ATC) from 5 to 50°C.
  • Factory calibrated — no additional calibration required.
  • Auto on/off to conserve battery.
  • 20 blue LED bar display for easy reading in any light.
  • Battery level indicator.
  • IP67 waterproof and floating.
  • 2-year warranty.

SPECIFICATIONS

  • EC Range: 0.2 to 4 mS/cm | CF Range: 2 to 40 | TDS: 140–2800 ppm (0.7 scale) / 100–2000 ppm (0.5 scale)
  • Resolution: 0.1 mS/cm / 1 CF / 70 ppm (0.7) / 50 ppm (0.5)
  • Accuracy: ±4% of reading ±1 resolution point
  • Calibration: Factory calibrated (no user calibration required)
  • Battery: 3 x 1.5V AA / ~3 years @ 10 tests/day
  • Dimensions: 17" length (420mm) / 1.2" diameter | Weight: 9 oz
  • Casing: IP67, floating

Frequently Asked Questions

Q: Does the Milwaukee EC40 PRO require calibration?
A: No — the EC40 PRO is factory calibrated and requires no user calibration ever. This makes it one of the most hassle-free EC/TDS meters available, ideal for growers who want fast, reliable nutrient readings without the time and consumables required for regular calibration. Simply dip and read.

Q: What is the EC40 PRO's waterproof rating and can it float?
A: The EC40 PRO is rated IP67 — fully submersible up to 1 meter for 30 minutes — and is designed to float if dropped in a reservoir or tank. This makes it exceptionally durable for daily use in wet hydroponic environments where accidental submersion is a real risk.

Q: What does the 20 blue LED display show and how do I read it?
A: The EC40 PRO uses a 20-segment blue LED bar display that illuminates proportionally to the EC/TDS level in your solution. Each LED segment represents a range of values, making it easy to see at a glance whether your nutrient solution is in the target zone — even in low-light grow room conditions. Readings are shown directly in mS/cm, CF, and ppm without any conversion needed.

Q: What EC and TDS range does the EC40 PRO cover for hydroponics?
A: The EC40 PRO covers 0.2 to 4.0 mS/cm EC, 2 to 40 CF, and 100 to 2800 ppm TDS (depending on conversion factor). This range covers the nutrient requirements of virtually all hydroponic crops — from light feeders like lettuce (EC 0.8–1.6) to heavy feeders like tomatoes and cannabis (EC 2.0–3.5+).

Q: Where can I buy the Milwaukee EC40 PRO nutrient meter?
A: You can purchase the Milwaukee EC40 PRO directly from Seres Ag at seresag.com. Seres Ag is a trusted supplier of professional hydroponic instruments, nutrient meters, 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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