Push down on the top ring/tabs (black in colour for Status TE-2A model) for the timer to turn on. Down activates the timer, up deactivates or turned off. Here a link to help.
http://www.uni-com.uk.com/instruction_manual_pdf/55297_24_hour_segment_timer.pdf
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First, you need a separate timer. Set the timer to 45 seconds, and place the timer on top of the microwave. Hope this helps!
Start both timers, when the four minute timer is done, there will be 3 minutes of sand left in the top of the seven minute timer.Restart the four minute timer, while letting the remaining (3 minutes) of sand to drop from the 7 minute timer. (this is your 1st 3 minutes of your nine minute measurement)When the 7 minute timer is done the 4 minute timer will now have 3 minutes of sand in the bottom. Flip the 4 minute timer (when this runs it will be your second 3 minutes of time). At the same time flip the 7 minute timer.When the 3 minutes of sand run on the 4 minute timer, restart the 7 minute timer by this time 3 minutes worth of sand will have gone to the bottom of the timer, resetting it will give you the last 3 minutes of sand for you last 3 minutes of time measuring the 9 nine minutes.
If you are under-employed or a part-timer.
n(n+1)/2 + 3Note that the difference between two consecutive numbers increases by one each time.
Minutes! Seconds as well if you like. {Not long ago my water supplier sent me advice etc on water-saving, including a shower-timer that is simply an egg-timer on a suction-cup so you can stick it to the shower wall! It runs for 4 minutes I think, which is certainly adequate even if you wash your hair as well.}