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SkyTach Introducing the new and improved SkyTach. It now has a 3190 max RPM viewing ability. A larger viewing window and re-designed and improved buttons. Still the same low price! RPM Range 1000 ¡V 3190rpm Accuracy +/- 2.5rpm Operating Battery Drain 29mA @ 9V Sleep Battery Drain 70uA @ 9V Sleep Time 30 Seconds Battery Type 6LR61 Alkaline 9V battery