Hanna Instruments HI9813-51 Portable pH/EC/TDS Meter (with Temperature)

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Hanna InstrumentsSKU: BIO69105

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Hanna Instruments HI9813-51 Portable pH/EC/TDS Meter (with Temperature)

Simple, Reliable Testing for Hydroponics & Greenhouses • One Probe for 4 Readings • Noise-Resistant pH

The Hanna Instruments HI9813-51 is an economical, water-resistant portable meter built for everyday testing in hydroponics, greenhouses, and agricultural water/nutrient solutions. It measures pH, EC (conductivity), TDS, and temperature using a single 3-in-1 probe—so you can check your nutrient strength and pH without switching devices.

This meter is especially practical in grow environments because it uses an amplified pH electrode that helps reduce interference from common equipment like pumps, motors, and ballasts. The large LCD includes helpful on-screen prompts, and calibration is straightforward using manual trimmers.

Why growers like the HI9813-51

✔ One meter for pH + EC + TDS + Temperature

Quickly check key nutrient-solution numbers using one probe—perfect for routine reservoir and irrigation testing.

✔ Stable pH in “noisy” grow rooms

The included probe includes a pre-amplified pH electrode, which helps protect readings from electrical noise from pumps and greenhouse equipment.

✔ Automatic temperature compensation (ATC)

EC and TDS readings are automatically compensated for temperature using a β coefficient of 2%/°C, so your results remain consistent even when water temperature changes.

✔ Smart EC-to-TDS conversion (variable factor)

The meter automatically adjusts the conversion factor based on the actual EC reading (per the 442 natural water curve), providing more meaningful TDS results across different solution strengths.

✔ Easy to use, easy to read

Dedicated buttons switch modes (pH, EC, TDS, temperature), and the large LCD shows readings with tutorial-style prompts and a low-battery indicator.

Technical Specifications (Highlights)

pH Range 0.0 to 14.0 pH
pH Resolution 0.1 pH
pH Accuracy ±0.1 pH
pH Calibration Manual, 1-point (offset trimmer)
EC Range 0.00 to 4.00 mS/cm
EC Resolution 0.01 mS/cm
EC Accuracy ±2% F.S.
EC Calibration Manual, 1-point (slope trimmer)
TDS Range 0 to 1999 ppm (mg/L)
TDS Resolution 1 ppm (mg/L)
TDS Accuracy ±2% F.S.
TDS Calibration Manual, 1-point (slope trimmer)
Temperature Compensation Automatic (0 to 50°C / 32 to 122°F)
Temp Correction Coefficient β = 2%/°C typical
EC→TDS Conversion Factor Variable (about 0.56 to 0.72) based on reading (442 curve)
Probe HI1285-5 amplified pH/EC/TDS/temperature probe, DIN connector, 1 m (3.3 ft) cable
Battery 9V, ~150 hours of use
Environment 0 to 50°C; RH max 100%

Best For

  • Hydroponic reservoirs and nutrient mixing

  • Greenhouse fertigation and irrigation water checks

  • Basic EC/TDS monitoring for fertilizer strength

  • Growers who want a reliable meter without extra complexity

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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