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Tools & Home Improvement > Electrical > Testers > Multi Testers > B002ZG8L7Q
  1. Hanna Instruments HI 991404 pH/EC/TDS/Temperature Monitor, Low Range EC and TDS
    Image(s) provided for illustrative purposes and may differ from the actual product
  2. Hanna Instruments HI 991404 pH/EC/TDS/Temperature Monitor, Low Range EC and TDS

    Delivery: 10-20 Working Days
    Customer Ratings (8 reviews)
    Price R5344.00

Product Description

  • Non-clogging double junction pH electrode for prolonging meter life
  • Automatic calibration and temperature compensation for ease of use
  • Self-check and stability indicator to indicate when to take a reading
  • Large LCD screen for readability
  • 12 Vdc power adapter for prolonged use
Additional Information

The HI 991404 pH/EC/TDS/temperature meter is a multi-parameter device for monitoring nutrient parameters in hydroponics, greenhouses, and horticultural applications.

Featuring a large easy-to-read LCD screen, automatic calibration and temperature compensation, the tester provides fast and accurate pH, electro-conductivity (EC), Total Dissolved Solids (TDS) and temperature readings. A self-check assures the device is in working condition, while the internal stability feature indicates when to take a reading. A hold function allows the user to freeze the display in order to record results. The HI 991404 also features a non-clogging double junction pH electrode and a conductivity probe.

The HI 991404 tester measures temperatures of 0.0 to 60.0 degrees C (32 to 140 degrees F) + or - 0.5 degrees C (+ or - 1 degrees F)/RH max 95% (+ or - 0.1 degrees C / 0.1 degrees F), and has a range of 0.0 to 14.0 pH (+ or - 0.1) with a resolution of 0.1 pH. EC range is 0 to 3999uS/cm (+ or - 2% F.S), with a resolution of 1uS/cm. TDS range is 0 to 2000pp(mg/L) (+ or - 2% F.S), with a resolution of 1ppm. The EC/TDS conversion factor is adjustable from 0.45 to 1.00. The device has an input impedance of 1E12 Ohm and operates on a 12 Vdc power adapter. The dimensions are 160 x 105 x 31 mm (6.3 x 4.1 x 1.2") and it weighs 190 g (6.7 oz.), a conveniently sized meter for taking measurements in the field. Note that the HI 991404 meter does not work with a digital ballast.

pH testers measure the acidity or alkalinity of a substance and are commonly used by researchers, manufacturers, and hobbyists.

Hanna Instruments manufactures a wide variety of analytical instrumentation, including pH meters, multi-parameter meters, electrodes, chemical reagents and buffer solutions. Founded in 1978, Hanna is headquartered in Woonsocket, RI, with subsidiaries in 32 countries. Hanna Instruments holds many firsts in the field of analytical instrumentation, including a pH electrode with a built-in temperature sensor, an electronic pocket-sized pH tester, and a replaceable electrode pH pocket tester. To ensure the quality of their products, Hanna is a vertically integrated manufacturer and does not subcontract any part of its manufacturing.

What’s in the Box?

  • HI 1293D pH electrode
  • HI 7630 probe
  • pH and EC calibration solutions
  • 12 Vdc power adapter
  • Instructions


Hanna Instruments
Hanna Instruments
Hanna Instruments
HI 991404
HI 991404
Hanna Instruments
Hanna Instruments
Most Helpful Customer Reviews

Had this unit for a few months now, and have been a more than a little disappointed with it.
First the good:
1. Back lit screen makes it easy to read in dark locations.
2. The EC/TDS meter works well and is easy to calibrate.
3. The temperature meter (built in to the EC/TDS probe) is also accurate on my unit.
4.The unit has mounting screws
5. The probes have threads for inserting into a closed system
6. Great email response from the service team

Ok Now the bad!
1. The pH probe has a non-standard plug, so you can only use this probe type. Other units use a standard BNC connector and your probe choice can be based on durability, maintenance and accuracy requirements.
2. When calibrating, you need to place both probes (pH and EC) into the calibrating solution - this means more calibration solution is wasted rinsing and submerging probes. - You will want a good 100mls of solution each time you calibrate.
3. The pH probe seems... Read more
I Ordered this item based on reviews of hanna products and thought this should most definatly suit me for my purposes. Upon arrival all packaging was in good condition with no damage. I set my meter up to the best of my ability however the ph meter would not calibrate. I used the device regardless and hoped that maybe it was an error on my part. After about a week of use the monitor stopped being continuos and started not being anything. Its just hanging on the wall , it shuts off immediatly after being turned on and does nothing but glow a green led light. This is a peice..if I ever saw one this is it. I contacted the Hanna tech dept. They asked a few questions and havent responded since. Overall I believe they hype their own products. This was a poor decision on my part..dont make the same mistake.
Please Note

The authorised South African distributor of this product is under no obligation to honour the manufacture's guarantees/warranties or to provide after-sales service.

Please note that this item is imported from the USA, and is designed to be used in the USA. In addition, if the unit is powered it will come with a US plug and an adapter/transformer may be required. Please click here for more information on power requirements, or check with us if you are unsure or need any assistance!

Please also note that certain items cannot be imported, these include Alcohol, Animals, Flammable Materials, Currency, Food, Furs, Chemicals, Explosives, Medications, Plants, Seeds, Supplements, Pressurized Cans, Tactical Equipment, Vitamins, Weaponry and Weaponry Accessories. In these cases, the item and information is displayed for reference purposes only. If you are not sure if we are permitted to bring an item, please send us an e-mail with a link to the item to confirm.

Please also ensure that you are ordering the correct item for your particular application as returns to the USA are costly. Product reviews are also provided for most of our items, which can give you a good idea for possible things to look out for and the quality of the item. By clicking Add to Cart, you are confirming that the item is correct and you accept the conditions listed here.