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Try recalibrating it by turning it on while holding the "tare" or "mode" button. It should show a raw data from the sensor then. Press the tare button again and it should calibrate the empty weight. Then it will show a specific weight you should put on, usually 100g. It should automatically finish calibration now. Hope this helps. The words before calibration on my scale was OUt2
Most likely HHH represents an error message telling you the weight of them item is higher than the scale can handle. For example if you had a very sensitive scale that weighed up to 50 carats and you put a 250 carats ring on the scale, it would give you an over load error message.
It worked on mine,
I pushed Mode, Power, Tare at the same time.
It came up in Cal mode.
I added penny's till it was 995 or so then added small pieces paper to it till it was 100 then up popped passed. I turned it off then it works fine now.
I thought the scale was just completely broken, I was able to fix by doing the following.
1. turn unit off 2. hold down the on/off/tare AND the MODE button. 3. The unit will come up with a bunch of numbers on the screen. Release the buttons 4. Press MODE once, you will see "100" flash on the screen. if you don't press the button a second time. 5. place 100g of tare weights on the scale. 6. Press MODE button again. After this my scale said PASSED and shut off. 7. remove tare weights and turn device on. It should now register properly.
In my case. the scale was misregistering the 50g weights as 75. I shut it off. I pulled up ever so slightly on the scale plate on the hinge side of the plate are repeated steps 1-7.
I have no idea why they don't have a 3 part calibration on these.