Click for larger image and other views

How can we improve our images or Product Specifications?

Other Documentation

Hanna Instruments HI 991401 pH/Temperature Monitor

Be the first to review this item


Specifications for this item
Number of Items
Inside Depth
4.1  inches
Measurement Type
Electrical Conductivity , Total Dissolved Solids (TDS) , pH , Temperature
Part Number
HI 991401
Item Weight
0.47 pounds
Brand Name
Hanna Instruments
Size Name
0.0 to 14.0 pH Range

This item is no longer available

This item is NOT eligible for "Free Standard Shipping on orders over $50.00" promotion. (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

  • Automatic calibration and temperature compensation for ease of use
  • Non-clogging interchangeable pH electrode to prolong life of meter
  • Large backlit LCD screen to reduce glare
  • Designed specifically for agricultural applications and handling high concentrations of phosphate and nitrate
  • Operates on 12 Vdc power adapter for prolonged use

Package Details

Shipping Weight: 1.95 pounds
Package Size: 7.6 x 7.1 x 5.2 inches

Product Description

The HI 991401 pH/Temperature meter is a waterproof device designed specifically for measuring pH and temperature in hydroponics, and agricultural applications.

Featuring a large easy-to-read LCD screen, automatic temperature compensation, and automatic calibration (at one or two points with two sets of memorized buffers), the tester provides fast and accurate pH and temperature readings. The HI 991401 also features a non-clogging pH electrode which was designed specifically to work in fertilizer solutions with high concentrations of phosphate and nitrate. A hold function allows the user to freeze the display to record results.

The HI 991401 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. Power is supplied through a 12-Vdc power adapter and the device has an input impedance of 1E12 Ohm. At 160 x 105 x 31 mm (6.3 x 4.1 x 1.2") and 190 g (6.7 oz.), the 991401 provides a conveniently sized meter for taking measurements in the field.

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 its 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
  • pH 4 and pH 7 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.