Non-Vented Wide Mouth LDPE Squeeze Rinse Wash Bottle for Plant Watering, 500mL Subcategory_Health and Genetics and iron rods for linear-expansion

and iron rods for linear-expansion comparison

and spring

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

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

Hand-crank centrifuge spins two 15mL tubes with a bench-top clamp mount for teaching sedimentation and separation concepts without needing electricity

Non-Vented Wide Mouth LDPE Squeeze Rinse Wash Bottle for Plant Watering, 500mL Subcategory_Health and Genetics and iron rods for linear-expansionBuilt for plant and succulent watering, this 500mL wide mouth LDPE squeeze rinse bottle features a non vented cap for controlled directed dispensing.