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Chrome-plated steel soil sampler removes cores in al..
For inland or marine waters. Includes necessary appa..
Efficient means of sampling water from any desired d..
Efficient means of sampling water from any desired d..
A rugged, clear plastic viewer with 5-mm squares on ..
A rugged, clear plastic viewer with 5-mm squares on ..
Clear polystyrene boxes for storing and exhibiting s..
Several useful field-collecting items for easy colle..
Everything students need to know about marine water ..
Metal, red alcohol-filled thermometer. Range, –10 to..
All plastic. For collecting small insects and other ..
Double-weight bristol board covered with black paper..
Heavy-duty cardboard with glass tops. Frames are cov..
Recommended for killing and retaining insects becaus..
One board is adjustable along the support so desired..