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The 18650, at 18mm diamter, would quite easily fit within 25mm, if it is used wired, rather than with an holder and if not attached to a pcb. How you then squeeze in the essential three pcb's might be the much bigger problem.

Sorry, but that is at odds with my own findings. I spent few weeks after building my iSpindel, experimenting with it before risking it in an actual brew and was surprised at just how accurate and reproducible its data output was. I used a Mk 4 PCB, in a 'big XL' PET. That PCB was a little too...

Sorry, I meant 'not ordered one' (above) the battery holder that is.

My reasons for not using the battery holder were that I had ordered one and I thought it would be handy to be able to adjust the position of the battery to fine tune to the 25 deg.

Same pcb here, in a PET big XL. I assume you have done the 90 deg calibration, with the PET perfectly horizontal? I soldered my battery in, rather than use a holder and proceeded to try to get it to 25 deg. It floated only slightly down from horizontal at the bottom. To get an idea of the...

I wonder if anyone has done any stability tests on the iSpindel tilt data? Today I ran a test, to see how much the tilt value changed with no actual change in the SG of the fluid - tap water. My little experiment began with a reported tilt of 19.77 deg and ended some 13 hours later with it...

Hi All, new to the forum and... Not quite finished yet, but I have built and got working an Ispindel, on a V4 PCB. I am still waiting for a switch and a higher capacity battery, before I call it finished, but working it is. I have opened a STEM account with Ubidots, which I have (rather badly)...