It’s obvious. But instructions like that give certain doubts about the product itself.
Honestly, I initially thought it was a multiple of the meter length. Then again, multiple of shoe size could be a valid guess too, if you had to base yourself on the vague product page.
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Hi
Are you from Zemismart? Can you confirm if this unit is certified for drinking water?
No, I am not associated with Zemismart in any way.
I don’t seem to be able to find anything in the manual or website that says it is NSF certified. I find that funny, TBH. You’d think it would have the NSF logo on it at the very least - especially since the website says it’s for “Control of domestic water valves” overlaid on a picture of a running kitchen faucet. No where in the manual or website does it say it’s safe for drinking water, but it’s clearly implied.
Looking at the pictures of the device, however, “ISO 4064-2014” is written on it, which is the ISO compliant number for “Water meters for cold potable water and hot water.” (ISO 4064-1:2014 - Water meters for cold potable water and hot water — Part 1: Metrological and technical requirements) Note that this ISO number is for the year 2014 and the standard has since been updated to 2024 (ISO# 4064-2024). I’d have to compare the two to see what differences there are.
Maybe their YouTube channel would respond? (https://www.youtube.com/watch?v=gvsZQ3FFpt4)
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It’s more sad than funny.
This is typical Tuya device sold online under different brand names and missing certifications. Just to find the real manufacturer might me a challenge.
ps. when I proposed to ask certification on post #10, I didn’t expect that they ever supply it…