Non-Vented Wide Mouth LDPE Squeeze Rinse Wash Bottle for Plant Watering, 500mL Subcategory_Health and Genetics Single-decade resistance box stepping from

Single-decade resistance box stepping from 1k ohm to 10k ohms in 1k-ohm increments on a rotary dial

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

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

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 Single-decade resistance box stepping fromBuilt for plant and succulent watering, this 500mL wide mouth LDPE squeeze rinse bottle features a non vented cap for controlled directed dispensing.