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WILDCO Ward PVC Counting Wheel If You search industrial then WILDCO Ward PVC Counting Wheel is best choice, Buy it now for Price is 97.90 Designed for use under a binocular dissection microscope (low power stereoscope) , this durable device provides an accurate, simple way to count zooplankton, as referenced in Standard Methods Groove has clear start and end point to avoid confusion Wheel rotates easily across the base Durable PVC Wheel is slightly blue tinted and can be used with an alcohol preservative Has a maximum volume of 13mL Comes with a 4\ Related Product WILDCO Ward PVC Counting Wheel LaMotte Macronutrient Plant Tissue Test Kit LaMotte Macronutrient Plant Tissue Test Kit lets you see if growing plants are receiving adequate amounts of nutrients from the soil All tests deliver qualitative results for each nutrient, so you can track down nutrient deficiencies as well as excessive nutrient conditions Kit includes tests for nitrates, phosphorus and potassium A single liquid extra...