Forestry Suppliers Tangent Height Gauge Mammalogy you can also use these

you can also use these scales as penetrometers to test soil compaction

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Forestry Suppliers Tangent Height Gauge Mammalogy you can also use theseThis mirror sighting height gauge is great for teaching students how to quickly determine tree heights! Easy to follow instructions are embossed onto its rugged plastic shell, detailing the gauges four step measuring method and height finding formulas.