Click for larger image and other views

How can we improve our images or Product Specifications?

Other Documentation

Hanna Instruments HI 991404 pH/EC/TDS/Temperature Monitor, Low Range EC and TDS

Be the first to review this item


Specifications for this item
Number of Items
Measurement Type
pH , Oxidation Reduction Potential (ORP) , Ion Selective Electrode (ISE) , Temperature
Part Number
HI 991404
Brand Name
Hanna Instruments
Style Name

This item is no longer available

Free Standard Shipping! on orders over $50.00.
(limited-time offer, certain restrictions apply) (Details)

  • Share

This item has already been added to

Update Quantity Cancel

Select a List Create New List

You can add a description later

Key Features

  • 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

Package Details

Shipping Weight: 2.05 pounds
Package Size: 7.7 x 7.2 x 4.8 inches

Product Description

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

How can we improve our Product Description?

Customer Reviews

There are no customer reviews yet.

Be the first to review this item

Go to the HomePage

Order by Phone
M-F 8am-10pm ET, Sat-Sun 8am-5pm ET 800-220-4242

My Account| Returns| Help

Website Feedback| Contact Us| Sell on AmazonSupply| Become an Affiliate

Privacy Notice| Conditions of Use

Follow Us 

© 2015, Inc. and its affiliates.