Non-Vented Wide Mouth LDPE Squeeze Rinse Wash Bottle for Plant Watering, 500mL Subcategory_Health and Genetics this 4-inch carbon-steel needle pivots

this 4-inch carbon-steel needle pivots on a brass cup bearing for low-friction rotation under the local field

Epoxy-coated steel wire test tube rack with 80 holes in an 8 by 10 layout

fastened by two wide-pad stainless steel thumb screws under heavy torsional load

and spring

the simple mount steadying optics elements at bench height for refraction

Non-Vented Wide Mouth LDPE Squeeze Rinse Wash Bottle for Plant Watering, 500mL Subcategory_Health and Genetics this 4-inch carbon-steel needle pivotsBuilt for plant and succulent watering, this 500mL wide mouth LDPE squeeze rinse bottle features a non vented cap for controlled directed dispensing.