FYI I have almost literally thrown my ELeaf ohm meter in the bin. Not quite, I kept it around thinking I might use the chassis to build a better one. But I have literally not used it since 30 minutes after I got it.
When I did manage to get readings from it, they were always way too high - at least 0.4Ω - 0.5Ω, as
@TheotherSteveS also said.
And I cursed myself for buying it in a rush in a B+M and not noticing it didn't have a 510 connection, just 2 x Ego with a 510 adapter. That adapter was absolute crap, it kept coming unscrewed whenever I tried to remove an atty. Eventually I tightened it down on the reader super hard with pliers. Unfortunately it turned out that the Ego port was held in by nothing more than glue, so when I tightened against it hard, it started spinning and I literally tore the wires off the connector internally.
When I opened it up I found a) a hot glue mess b) thin crappy wires going from the board to the connectors- thin enough that I'm sure they'd be adding their own static resistance to the readings c) that actually I didn't have wires attached to my resistance connector any more, because the connector had rotated in place and pulled them off their (crappy) soldering.
So yeah. Do yourself a favour for your peace of mind, chuck that thing in the bin and buy another one

FastTech have a few listed and in one or two of the discussion threads for them, people have posted some comparisons trying to work out which is most accurate. None of them are
really accurate, but any of them will be better than the ELeaf - and at least they have a built in 510 connector so you don't need a stupid adaptor.
Sorry

I just hated that thing. Worst £10 I've spent in recent memory.
This is what I use for measuring ohms now - a Fat Daddy v3 Shorty soldered into short wires connected to 4mm gold-plated banana plugs for the DMM connection; the wires are the thickest wires that would fit in the positive pin (1.5mm shielded copper.) Actually I realised later I could have used 2.5mm for the negative connection, but ohms are so low I don't think I need bother re-doing it:
When I short the connection, the ohms read 0.00Ω on the DMM - so the 510 and wiring and connectors combined have less than 0.005Ω static resistance; the DMM displays to two decimal places so >=0.005Ω would round to 0.01Ω.
I get my Evic-VT full kit hopefully tomorrow, so I will validate the ohms readings against my DMM and against my accurate TC mods (DIcodes 2380, Evolv DNA 40).
(I really do need to make some kind of case/base for it though. Cable tie to Helping Hands kinda works but is neither the most stable, nor certainly the most stylish solution

)