Digital Quartz Stopwatch, 1/100 Second Precision Material_Wood Used to introduce photoconductivity and

Used to introduce photoconductivity and light-controlled circuits

bottle in borosilicate glass holds 125mL with glass stopper for biological oxygen demand testing and water quality analysis

5cm diameter for spring-constant

Used to introduce known resistance into a circuit by removing brass plugs from sealed coil contacts

DIS ignition coils

Digital Quartz Stopwatch, 1/100 Second Precision Material_Wood Used to introduce photoconductivity andQuartz driven digital stopwatch with 1 100th second precision and a built in alarm, displaying hours, minutes, seconds, date, and month on a multi function readout for lab and classroom timing.