Nitrite Meter HR HI93708 - Garden Pools & Bridges

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Ion-specific meters provide a quick, precise and economical way of measuring ion concentrations. These lightweight portable meters have none of the problems associated with expensive ion selective electrodes, but instead rely on an advanced microprocessor and diode photocell to measure a single photometric parameter. Inexpensive reagents make the cost per test often less than traditional chemical test kits and considerably more accurate - typically +/-4%. All units feature a large LCD display and a battery life equivalent to at least 300 tests. Supplied with 2 cuvets, caps, 9v battery and instruction manual.

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Ranger 15T - Accurate and easy to use, the Ranger 15 is our most popular compass. It has red/black north/south lines in the capsule for quick and accurate course setting, luminous markings for navigation in the dark, large sighting mirror and rubber grip feet. Units: mm, inches. Scales 1:25 000, 1:50 000

Grain Size Card - This pocket sized laminated card has sorting charts, roundness index and percentage area information for use when looking at sedimentary rock and percentages of minerals in rocks. Card size 7cm x 11cm

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