25-Pack Sterile 4-Compartment Triple-Vented Polystyrene Petri Dishes, 90mm Physics_Density and wax candle for student

and wax candle for student investigations of oxygen consumption during combustion in general chemistry lessons

Kit for determining differences between acid and base properties

Used to replace dry-cell stacks at the bench

Used to introduce semiconductor rectification

this multiplier extends the instrument's range by dropping most of the bench voltage across an external load resistor

25-Pack Sterile 4-Compartment Triple-Vented Polystyrene Petri Dishes, 90mm Physics_Density and wax candle for studentFour compartment layout on this 25 pack of sterile 90mm petri dishes supports four condition microbiology comparisons on a single plate.