Hanna Instruments HI9812-51 Portable pH/EC/TDS/Temperature Meter

Save 8%
Hanna InstrumentsSKU: HY-2512

Sale price$ 349.95 Regular price$ 379.99
🍃 Earn 349 GrowClub points worth $3.5 off your next order
  • Free Shipping over $149.99 Canada-wide
  • Ships discreetly
  • Ships in 3-5 business days
Bulk / Commercial Discounts and Rebates

Email us or call 888-349-0321 TODAY!

Hanna Instruments HI9812-51 Portable pH/EC/TDS/Temperature Meter

Economical Waterproof Combo Meter • 3-in-1 Amplified Probe • Water Quality & Nutrient Testing Made Simple

The Hanna Instruments HI9812-51 is a cost-effective, portable pH/EC/TDS/temperature meter designed for fast, reliable water quality measurements using a single multi-parameter probe. Built for everyday testing in hydroponics, greenhouses, agriculture, and general water quality applications, this meter combines essential readings—pH, conductivity (EC), total dissolved solids (TDS), and temperature (°C)—in one easy-to-use handheld unit.

With a large LCD that displays step-by-step tutorial prompts, dedicated measurement buttons, and simple single-point manual calibration, the HI9812-51 is ideal for users who want accurate, practical results without complicated menus.

Why Choose the HI9812-51 Combo Meter?

✔ All-in-One Testing with One Probe

Measure four critical parameters without switching instruments:

  • pH (0.0 to 14.0)
  • EC (0 to 6000 µS/cm)
  • TDS (0 to 3000 ppm)
  • Temperature with automatic compensation

This makes the HI9812-51 perfect for nutrient solution checks, irrigation water testing, and routine quality control.

✔ Amplified pH Electrode for Grow-Room Noise Resistance

The included probe features a built-in amplifier that reduces interference from common sources of electrical noise such as pumps, motors, ballasts, and humid greenhouse environments. This helps stabilize pH readings where standard electrodes may drift.

✔ Simple Manual Calibration (Single Point)

Calibrate quickly using two trimmers:

  • pH calibration: pH 7.01

  • EC/TDS calibration: 1413 µS/cm (1.41 mS/cm) or 1500 ppm

This straightforward process is ideal for daily users who want consistent readings with minimal downtime.

✔ Automatic Temperature Compensation (ATC)

EC and TDS readings are automatically compensated from 0 to 50°C, helping reduce temperature-related measurement errors. The temperature correction coefficient is set at β = 2%/°C.

✔ Durable 3-in-1 Probe Built for Real Use

The supplied HI1285-51 probe houses:

  • pH sensor (gel-filled, maintenance-free)
  • Amperometric EC/TDS sensor (stainless steel pins)
  • Built-in temperature sensor

All inside a rugged polypropylene body engineered for fast response and reduced contamination.

Key Features

  • Waterproof / water-resistant portable design
  • Large LCD with tutorial instructions + battery indicator
  • Dedicated measurement buttons for quick switching
  • 3 sensors in one probe (pH/EC/TDS/temperature)
  • Pre-amplified pH electrode for stable readings
  • Low battery indicator for reliable operation

Specifications (Highlights)

pH 0.0–14.0 | Resolution 0.01 | Accuracy ±0.1 pH
EC 0–6000 µS/cm | Resolution 10 µS/cm | Accuracy ±2% F.S.
TDS 0–3000 ppm | Resolution 10 ppm | Accuracy ±2% F.S.
EC→TDS Factor 0.5 ppm (mg/L) = 1 µS/cm
Temperature Compensation Automatic (0–50°C)
Power 9V battery | ~150 hours continuous use
Dimensions 145 x 80 x 36 mm
Weight 230 g

 

What’s Included

HI9812-51 (HI9812-5) is supplied with:

  • HI1285-5 multiparameter probe (pH/EC/TDS/temperature, DIN connector, 1 m cable)
  • pH 7.01 buffer sachet
  • 1382 ppm calibration solution sachet
  • 1413 µS/cm calibration solution sachet
  • Electrode cleaning solution sachets (2)
  • 9V battery, instructions, and rugged carrying case

Best For

  • Hydroponics and greenhouse nutrient monitoring
  • Irrigation and agricultural water testing
  • General water quality measurement (EC/TDS/pH)
  • Users who want an economical, all-in-one portable meter

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.

Recently viewed