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Hanna Instruments HI 991401 pH/Temperature Monitor Review
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.
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Oakton EcoTestr pH 2 Waterproof pH Tester, -1.0 to 15.0 pH Range Review
The Oakton 35423-10 EcoTestr pH 2 is a handheld, waterproof, and dustproof pocket meter that measures pH and floats, if dropped in liquid. A portable pocket meter is commonly used to measure the pH of substance in hydroponics, education, water treatment, and swimming pools. This meter has ATC for accurate readings in fluctuating temperatures, and push-button calibration capabilities up to three points for a wide range of results. It features a transparent, protective cap to reduce contamination and protect the sensor. The cap keeps the sensor moist when stored upright, and can be used as a container for sensor-conditioning, or on-site calibration. The meter’s waterproof and dustproof housing has IP67-rating for protection against solid objects or liquids. The testr has a long-lasting sensor with Polyvinylidene Fluoride (PVDF) reference junction with polymer gel for long lifespan. The meter has a large, upright, single-line LCD screen for ease of viewing, a hold function which freezes readings for recording, and an auto shut-off to extend the life of the batteries. It has a click-lock battery cover for battery access to replace batteries without tools.
The 35423-10 pocket meter comes with an integral sensor, has ATC from 0 to 50 degrees C (32 to 122 degrees F), and works in an operating temperature of 0 to 50 degrees C (32 to 122 degrees F). It has three-point automatic calibration at three US buffer values of US 4.0, 7.0 or 10.0. pH range is 0.0 to 14.0, resolution 0.1, accuracy + or - 0.1. Its dimensions are 1.25 (l) x 1.5 (w) x 6.5 (h) inches (3.2 x 3.8 x 16.8 cm) and it weighs 3.25 ounces. The testr works with four 1.5-V alkaline batteries (not included) for up to 250 hours of continuous use (Eveready A76 or LR44 replacements).
pH testers measure the acidity or alkalinity of a substance and are commonly used by researchers, manufacturers, and hobbyists in aquaculture, agriculture, hydroponics, wine-making, and water-testing, and for scientific applications.
Oakton Instruments manufactures an array of scientific instruments for research, industrial, and educational uses. Since 1991, Oakton has distributed a wide variety of instruments such as meters, electrodes, and transmitters. Oakton is based in Vernon Hills, IL, and has facilities in Europe, Asia, and China.
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