Patrik, I have a couple of hand-held meters. They don't agree, no surprise. The two that have been adjusted/recalibrated fairly recently both give good advice. The third was fine until something electrical inside failed.
I bought all three used. All three functioned on receipt and gave results consistent with my Nikons' on-board meters in broad daylight. All three were very nonlinear and basically not safe to use until they'd been overhauled. After that, safe to use.
From which I conclude that all used meters with unknown history are broken until repaired.
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