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Total number of ballasts: 80 either in one room or 2x40 in 12/12
Easy to replace
increasing airflow by 40%
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Observational Research Stopwatch Meters & Solutions Total number of ballasts: 80A unique stopwatch which allows the timing of a subject without disturbing it. For captive and field research, or in classrooms. Hands free operation allows for freedom of movement. The alarm is audible only through a headphone. The alarm can be set for repetitive intervals of every 0. 25 second to every hour. Two 1 100th second displays. Counts up or down to 10 hours. Ideal for multiple and simultaneous processes. In stopwatch mode, current lap time