When a scale is gradually increasing or decreasing in weight on its own, it is experiencing drift. First, make sure that the scale is on a stable surface and that there are no outside factors that could be putting slight weight on the scale, like a fan or a busy work environment.
The base of the Lunar may have shifted to where it is touching the shell. To adjust, loosen the two 2mm hex bolts on the back of the scale slightly so that the base can be moved. Realign the base so that there is an even gap between the base and the shell (see 2.1). Retighten the two hex bolts.
One of the two sets of 2mm hex bolts may have come loose. There is a set of two bolts on the bottom of the scale, securing the base to the load beam, and there is another set of two securing the load beam to the top shell (see 2.2). Make sure both sets are snug, and make sure the load beam is straight, not touching any of its surroundings.
After checking 1 & 2 above, perform a calibration
There is a chance a piece of black protective foam is stuck in between the base and shell (see 2.3). Each Acaia Pearl is shipped with a foam strip between the base and shell to protect it while in transit. Sometimes when removing the foam strip a piece can get stuck, providing just enough pressure for the scale to detect, causing the weight to drift up and down. You can remove the foam with an X-Acto blade or razor.
Make sure that both sets of Phillips head screws keeping the base and load beam in place are snug. There is a set of two Phillips head screws on the bottom of the scale, securing the base to the load beam, and there is another set of two securing the load beam to the top shell (see 2.2).
3. After checking 1 & 2 above, perform a calibration
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