When measuring the compression of an engine, the engine needs to rotate at standard RPM.
The actual rotational speed can be shown slightly higher and lower than this figure, when it's higher or lower than 250 RPM it displays slightly high or low pressure.
This tester on the other hand will automatically calculate the reading for 250 RPM.
The rectified value is displayed by moving the positional switch to the "250"position which is the same as "Analogue"mode but does not change the tester to analogue mode.
1.Complete a measurement in digital mode as actual data.
2.Slide the mode switch from the "Digital" side to the "250" side. (also showing "Analogue")
3.Once the switch has been moved to the "250"position the compensated readings are displayed.
4.Slide the mode switch back to "Digital" to see actual measurements.
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