Hanna Instruments HI981420 GroLine Monitor for Hydroponic Nutrients

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Hanna InstrumentsSKU: HY-06028000039

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Hanna Instruments HI981420 GroLine Monitor for Hydroponic Nutrients (Standard Probe, No Threads)

24/7 pH + EC/TDS + Temperature Monitoring • Data Logging • Quick Cal Calibration • IP65

The Hanna Instruments HI981420 GroLine Monitor is a professional-grade, continuous monitoring system built specifically for hydroponics, aquaponics, and greenhouse growing. Designed to run around the clock, it provides real-time measurement of pH, conductivity (EC), TDS/ppm, and temperature directly in your nutrient solution—so you can keep your feed stable, avoid swings, and protect yields.

With a large, easy-to-read display, built-in alarms, automatic logging, and a rugged IP65 enclosure, the GroLine Monitor makes nutrient management simple: set it up once, and keep your system dialed in 24/7.

Why Growers Choose the GroLine Monitor HI981420

✔ 24/7 Nutrient Control at a Glance

A clear LCD shows your essential readings in real time—pH, EC/TDS, and temperature—so you instantly know what’s happening in the reservoir. High/low alarms flash warnings when your solution drifts out of range.

✔ One Probe, Three Measurements

The included HI1285-8 3-in-1 pre-amplified probe combines:

  • pH electrode with renewable cloth junction
  • Amperometric EC/TDS sensor
  • Internal temperature sensor for compensated readings

All housed in a durable polypropylene body for easy handling and long-term reliability.

✔ Quick Cal = Faster Calibration, Less Maintenance

Calibrate pH and conductivity quickly using a single Quick Cal solution (compatible with the GroLine Quick Cal function). You can also calibrate with standard pH buffers and EC standards when needed.

✔ Built-In Data Logging for Smarter Decisions

The GroLine Monitor automatically logs measurements every 15 minutes and stores the last 30 days of data, including minimum, maximum, and average values—helping you spot patterns, troubleshoot problems, and prevent future issues.

✔ Grow-Room Tough (IP65)

The IP65-rated enclosure is designed for humid, demanding grow environments. An ambient light sensor automatically dims the display for comfortable viewing day or night.

✔ GLP Feature for Professional Accuracy

Good Laboratory Practice (GLP) functions store the last 5 pH and EC calibrations, helping you maintain consistent calibration habits and dependable readings.

Key Features

  • Continuous monitoring of pH, EC, TDS/ppm, and temperature
  • Wide pH range: 0.00 to 14.00
  • Selectable TDS factor: 0.5 (500 CF) or 0.7 (700 CF)
  • Automatic Temperature Compensation (ATC) with temperature shown in °C or °F
  • Large LCD with plant-friendly green backlight
  • Real-time screens + graph view + log recall
  • High and low alarms (enable/disable per parameter)
  • USB-C data transfer to flash drive or compatible device
  • Rugged HI1285-8 probe with 2 m (6.6 ft) cable

Technical Specifications (Highlights)

pH 0.00–14.00 | Resolution 0.01 | Accuracy ±0.05 pH
EC 0.00–10.00 mS/cm | Resolution 0.01 | Accuracy up to ±0.1 mS/cm
TDS up to 5000 ppm (0.5 CF) or 7000 ppm (0.7 CF)
Temperature 0.0–60.0°C (32–140°F) | Accuracy ±0.5°C / ±1°F
Logging automatic (15 min intervals, last 30 days)
Ingress protection IP65
Power 12VDC adapter (included)

 

What’s Included

HI981420 is supplied with:

  • HI1285-8 multi-parameter probe (standard probe, no threads)
  • Quick Cal buffer solution sachets (2)
  • Electrode cleaning solution sachets for agriculture (2)
  • 12VDC power adapter
  • Calibration certificates for meter and probe
  • Instruction manual

Perfect For

  • Hydroponic reservoirs and fertigation tanks
  • Aquaponic systems
  • Greenhouse nutrient monitoring
  • Growers who want stable pH and EC for consistent yields

Order Confirmation

As soon as your order is placed, an order confirmation will be sent to the email address you used to place the order. This means we have received your order and payment. Payment is captured as soon as the order is placed. In rare cases, if the product is on backorder or unavailable, we will contact you and ask if you would like to wait for the product to become available, switch your product, or have your payment refunded. If the item is available for shipment we will submit the order for processing and arrange shipment. Please see current estimated lead times on the product page for each product.

Shipping

Most products ship within 1 to 3 business days. Some items might take longer as they are delivered from our warehouse in Vancouver. As soon as we receive your tracking number, we will send it over to you.

Free Shipping

Free shipping is available across all provinces throughout Canada for orders over 149$.

International Orders

Nearly all of our brands can be shipped internationally using FedEx, UPS, USPS, DHL or other couriers. Most quotes can be obtained at checkout. If not, you can email us at info@canadagrowsupplies.com for some more information on shipment. Items shipped internationally from the USA may have VAT, duties, taxes, and/or local charges due at delivery. These charges are the responsibility of the customer and not Canada Grow Supplies Inc.

Cancellations

If you need to cancel your order, we recommend reaching out to us ASAP. We charge a 2.9% (credit card), 3.5% (PayPal), 4.0% (PayPal International), 4.1% (American Express), or 6.5% (Shop Pay Installments or Sezzle) order cancellation fee after the order was received. We can accommodate most requests, but due to the different time zones and schedules that our warehouses ship from, sometimes the cancellation request may not reach the warehouse in time before the product ships. Once the item has been arranged to ship or has shipped, the package will be treated like a 'return' and is subject to ship-back fees and restocking fees. If you purchased 'Route Package Protection', this can not be refunded after the order has shipped.

Returns

In order to make sure you are completely satisfied, we can send you a return label within 14 days of receiving the order. This is to guarantee that you are happy with the product. Some products might require a 10-25% restocking fee. Please visit our full return policy.

Why Canada Grow Supplies?

We’re glad you clicked here. It means you’d like some reassurance and we totally understand that.

1. We’ve had thousands of shipped orders and satisfied customers.

We started our business in 2020 with the intention of creating a one-stop shop for growing supplies without letting customers wait for their orders. We saw the potential to serve customers of this industry way better than they’ve been treated in the past.

2. We’re a small, Canadian, family-owned business.

Our small team overlooks every customer and their orders to ensure they are satisfied with their products. We answer the phone and website chat, and if we don’t, we get back to you within 6 hours or less! We even throw in some freebies at random.

3. Free Discreet Shipping Available in Canada

We offer free shipping on all orders over 149$ Canada-wide. Many companies have a weight limit for free shipping, we don’t!

4. 100% Lowest Price on the Market - Price Match Guarantee

We keep the best prices on the market at all times. If the price respects the companies’ lowest retail price, we will definitely price-match any other Canadian website.

5. Reliable International Shipping

Nearly all of our brands can be shipped internationally using FedEx, UPS, USPS, DHL or similar couriers. Go through the checkout process to receive a shipping quote or contact us if a shipping quote is not available at checkout.

6. Easy financing and interest-free payments

Finance your purchase within minutes without paying interest!

Sezzle: Buy what you want today and pay for it over four installments, interest-free. Look for the Sezzle button at checkout. Get approved up to $2,500.

7. We are authorized resellers with manufacturer’s warranty

You will buy confidently from us since only sell new, official products (no used items or clones). All warranties are new are 100% honored through the respective manufacturer.

8. Safe, Secure and Discreet Transactions

We accept major credit cards and debit cards, PayPal, Google Pay, Apple Pay, Sezzle, bank transfers, and money orders. All card payments are processed through our encrypted SSL security processing system. Your identity is always protected.

9. Hassle-free returns

Just in case your purchase was not up to your standards, we offer return shipping if you are not 100% satisfied for any reason

10. Route Package Protection

Adding Route Package Protection to your order at checkout means that your order is protected against being lost, damaged, or stolen. In the unfortunate instance that you experience one of these inconveniences, you can report an issue with Route and they will work with you to make sure you get the resolution you prefer.

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