Digital Count Down/Count Up Timer with Clock Certified:Yes the timer starts counting up

the timer starts counting up to show elapsed time since alarming

(2 Days $2500)

Measures pH

as well as ROS and their sources

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Digital Count Down/Count Up Timer with Clock Certified:Yes the timer starts counting upDigital Count Down Count Up Timer with Clock, White grey Sper Scientific 810015 Digital Count Down Count Up Timer with Clock 5 Channel. 4 independent channels each of which counts up or down for any interval from 1 second to 100 hours, plus clock button. Count Up Channel: 4 Count Down Channel: 4 Range: 100 Hours Resolution: 1 Second Optional Certification option available