Milwaukee EC40 EC/TDS Nutrient Meter

Availability: Many In Stock
DESCRIPTION The Milwaukee EC/TDS Nutrient Meter is designed for Hydroponics, horticulture and agriculture to help you make...
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  • Seres


The Milwaukee EC/TDS Nutrient Meter is designed for Hydroponics, horticulture and agriculture to help you make sure that your vegetables and plants are receiving the right amount of nutrient to promote healthy growth with low to zero product waste. Keep EC/TDS in your target range to help your achieve better results.


  • Measures conductivity (EC) and total dissolved solids (TDS) with automatic temperature compensation.
  • Ideal range for Hydroponics (0.2 to 4 mS/cm | 2 to 40 CF | 140 to 2800 ppm 0.7 scale | 100 to 2000 ppm 0.5 scale).
  • Units directly in mS/cm/CF/PPM (no conversions required). 
  • Factory calibrated no continious calibration required.
  • High accuracy.
  • Automatic Temperature Compensation (ATC).
  • Auto on/off feature.
  • Blue LED display.
  • Graphite electrode in ABC + PC body.
  • Battery level indicators.
  • Battery life up to 3 years with approx. 10 measurements per day.
  • 3 X 1.5V AA (batteries included).




EC/TDS electrodes can develop nutrient build up over time. To miminize build up, always rinse the probe in fresh tap or DI water after every use.


The Milwaukee EC40 meter, like all conductivity meters, provides a measure of electrically charged ions in a solution and is an absolute measure of conductivity.

EC is often converted to TDS in parts per million (ppm). Different scales include the 500 scale, 650 scale and the 700 scale. However, the EC40 has all the readings direct EC/TDS/CF.  

RANGE: 0.2 to 4 mS/cm | 2 to 40 CF | 140 to 2800 ppm 0.7 scale | 100 to 2000 ppm 0.5 scale
RESOLUTION: 0.1 mS/cm | 1 CF | 70 ppm (factor: 700 ppm = 1 mS/cm | 50 ppm (factor: 500 ppm = 1 mS/cm)
ACCURACY: EC: ±4% of reading | ± 1 resolution point
TEMPERATURE COMPENSATION: Automatic 5 to 50°C / 41 to 122°F


  • Range: 0.2 to 4 mS/cm
  • Range: 2 to 40 CF
  • Range: 140 to 2800 ppm 0.7 scale
  • Range: 100 to 2000 ppm 0.5 scale
  • Resolution: 0.1 mS/cm
  • Resolution: 1 CF
  • Resolution: 70 ppm (factor: 700 ppm = 1 mS/cm)
  • Resolution: 50 ppm (factor: 500 ppm = 1 mS/cm)
  • Accuracy: ±4% of reading, ± 1 resolution point
  • Calibration: Factory calibration (no additional calibration required)
  • Probe: Graphite electrode in ABC + PC body
  • Temperature Compensation: Automatic from 5 to 50°C (41 to 122°F)
  • Battery Type: 3 x 1.5V AA (included)
  • Battery Life: Approx. 3 years @ 10 tests per day
  • Measurement Display: 20 blue LEDs bar
  • Environment: 0 to 50°C / 32 to 122°F; max RH 95%
  • Dimensions: 17" inches length (420 mm) / 30 mm diameter (1.2")
  • Weight: 9 ounces (255 g)
  • Casing Protection: IP67, floating
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 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.


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.


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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