pH 1-14 Indicator Paper Dispenser Subcategory_Bases and Rods Lamp-house assembly dimensioned as the

Lamp-house assembly dimensioned as the matched replacement unit for optical bench and light-source apparatus when the original housing reaches end of life

Spring-loaded two-prong jaws self-adjust to apparatus up to 2

this Jolly's photometer turns the inverse-square law into a measurable observation

with circuit diagram printed for demonstration

Seven-metal 20mm density cube set with element-stamped brass

pH 1-14 Indicator Paper Dispenser Subcategory_Bases and Rods Lamp-house assembly dimensioned as theDispenser feeds pH 1 14 indicator strips one at a time for quick bench top pH testing with minimal contamination of the remaining roll.