Spare Bulb for Ray Box, 12V 21W Subject_Biology Decade capacitance box stepping from

Decade capacitance box stepping from 10pF to 100pF in 10pF increments at plus-or-minus 5% on a 63V rating

Polypropylene test tube rack with two 25-mm outer holes

Thirty-part life-size muscular torso separates to expose superficial and deep musculature alongside dual-sex reproductive organs for comprehensive anatomy teaching

letting students compare force ratios across four different radii in a single assembly

Long 1000mm black insulated lead with crocodile clips at both ends

Spare Bulb for Ray Box, 12V 21W Subject_Biology Decade capacitance box stepping fromBright filament bulb rated 12V 21W, dimensioned to fit the PH0600A ray box housing as a drop in replacement for the original lamp.