With r1.4, it should be the equivalent of a t15, but it might be the wrong cell.
Move the switch to off, wait 1 minute, move the switch to auto, scroll to instant salt (the number after 100p) and watch the number as the unit comes on. It should start high and go down the the salt reading. If the display reverts to the average salt level, press the diagnostic button to get back to instant salt. Instant salt has a negative sign in front to differentiate it from the average salt. Report the instant salt level. Also get the other diagnostics when generating.
Also note that the Swimpure is the same as an aquarite. Hayward makes the same model under a bunch of different names. Swimpure, H40, mineral springs, naturesoft, smartpure etc.