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The current phone signal level from 0-8 inclusive on a rougly linear scale. On some CDMA phones, the level will rise in steps of 2 (0,2,4,6,8). The value is -1 if the value is unknown or there is e.g. no service.
There is a bug with some Android versions that the reported signal strength is not updated until the device is turned off and on.
Did you try reading the Tasker user manual?
a while ago I had it displaying between 2-15 and then suddenly it only started displaying "-1"
So this kind of ruins my ability to detect "no signal" to enable/disable airplane mode.