Milwaukee EC45 EC/TDS Stick Meter

Milwaukee EC45 PRO is a professional instrument for rapid measurement of electrical conductivity (EC), total dissolved solids (TDS) and Conductivity Factor (CF) in nutrient solutions. Designed specifically for hydroponics, greenhouses, fertigation systems and professional horticulture, it provides instant measurements without calibration. Its IP67 waterproof housing floats on water and is suitable for daily use in reservoirs and mixing tanks.

Milwaukee EC45 PRO is designed for growers who want to monitor nutrient-solution concentration quickly and reliably. Maintaining the correct EC value is essential for optimal nutrient uptake and preventing plant deficiency or overfeeding. EC45 PRO measures EC, TDS (500 and 700 ppm scale) and CF, allowing use of the grower's preferred measurement system.

The instrument is exceptionally easy to use – simply immerse the measuring section in the solution. It has no buttons, switches on automatically when immersed and, once the reading stabilises, switches itself off after about 30 seconds, greatly extending battery life. The bright 24-LED indicator shows the measured value, battery status and warnings for values outside the measurement range.

Unlike standard EC testers, EC45 PRO is factory calibrated and does not require periodic user calibration. The graphite electrodes resist build-up, and the robust housing allows the instrument to be used as a stirring rod when preparing nutrient solutions. Thanks to automatic temperature compensation, readings remain accurate between 5°C and 50°C.

Technical specifications

✔️ Manufacturer: Milwaukee Instruments

✔️ Model: EC45 PRO

✔️ Type: EC / TDS / CF meter

Measurement ranges

✔️ EC: 0.2 – 6.0 mS/cm

✔️ TDS (500): 100 – 3000 ppm

✔️ TDS (700): 140 – 4200 ppm

✔️ CF: 2 – 60 CF

Resolution

✔️ EC: 0.1 mS/cm (up to 4.0 mS/cm)

✔️ EC: 0.25 mS/cm (4.0 – 6.0 mS/cm)

✔️ TDS 500: 50 ppm / 125 ppm

✔️ TDS 700: 70 ppm / 175 ppm

✔️ CF: 1 CF / 2.25 CF

✔️ Accuracy: ±4% of reading ±1 digit

✔️ Automatic temperature compensation: 5 – 50°C

✔️ Factory calibrated

✔️ Graphite electrode

✔️ LED display with 24 blue LEDs

✔️ Automatic switch-on

✔️ Automatic shut-off

✔️ Power supply: 3 × AA alkaline batteries

✔️ Battery life: up to 3 years (about 10 measurements per day)

✔️ Protection: IP67

✔️ Floating housing

✔️ Dimensions: 444 × Ø30 mm

✔️ Weight: 265 g (with batteries)

📦 The kit includes

✔️ 1 × Milwaukee EC45 PRO Nutrient Stick Meter

✔️ 3 × AA alkaline batteries

✔️ Protective cap

✔️ User manual.

Benefits

✔️ Measures EC, TDS and CF with one instrument

✔️ No calibration required

✔️ Automatic power on and off

✔️ Waterproof housing IP67

✔️ Floats if dropped in water

✔️ Highly durable graphite electrodes

✔️ Automatic temperature compensation

✔️ Clear LED indication

✔️ Suitable for everyday professional use

✔️ Works as a measuring instrument and stirring rod at the same time.

📋 Instructions for use

1. Remove the protective cap.
2. Immerse the electrode in the nutrient solution.
3. Gently stir the solution with the instrument for an even measurement.
4. Wait for the LED indication to stabilize.
5. When finished, rinse the electrode with clean water.
6. When necessary, clean the electrode periodically according to the manufacturer's instructions.

⚠️ Important: Although the EC45 PRO does not require calibration, the manufacturer recommends regular cleaning of the graphite electrodes to prevent salt and nutrient residue buildup, which can affect measurement accuracy.

💡 Urban Botaniks tip: Check the EC value daily, especially when growing hydroponically. This will help you maintain the optimal nutrient solution concentration, avoid salt buildup, and ensure maximum plant growth and yield.