Reinsert the arms into the slots in the housing, and replace the PCB.

Tighten in the PCB with the centre screw.

Reconnect the tab from the arms into the zif connector. Touch the arms to test if they are measuring.

Replace the top housing. Be sure to carefully fit the screen into the rectangle in the top housing; failing to do so may damage the screen.

Replace the 4 screws in the bottom.

Replace the tips after cleaning with isopropyl.

If the device begins to give false readings, remove the tips and clean again. If the problem persists, look for bits of debris. Tiny pieces of metal caught in the screw threads or between the tips and the flex can cause the misreadings.