Hi -
First, make sure the battery in the tester is good. If unsure of the batteries charge state, replace them (requires {4} IDEAL# 61-201,
IEC #LR44, or NEOA# 1166A) before continuing.
What you're describing sounds an awful lot like a testing of a capacitor. If you were to connect an analog ohm meter to a capacitor, the needle would indicate a very low resistance value and gradually swing to a very high resistance value. it would not take more than a few seconds to go from low to high indication. Use of a digital meter wouldn't show this very well, as the resistance value is constantly changing - rendering an actual numeric value impossible to display.
Once the resistance value has reached the high value on the meter, swap the polarity of the leads, and it should read low again - and climb to the high value once more. This will happen each time the leads are reversed.
You can view the manual
here.
I hope this helps & good luck!
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