"Complete Meter Stick Optics Bench"

Timer can be programmed in countdown mode or stopwatch mode up to 99 minutes, 59 seconds.

This single-channel timer is switchable between 19 hours: 59 minutes and 99 minutes:59 seconds.

Single-channel, three-button timer has a timing capacity of 99 minutes: 59 seconds, counts either up or down, and remember the last time set.

This ten-button timer allows direct input for faster programming of desired time.

Measure the speed and acceleration of objects by counting the number of dots in a measured length of ticker tape.

Microcomputer chip permits setting four separate channels for simultaneous countup or countdown procedures.