Pete C. wrote:
Out of curiosity, has anyone here ordered the Enco 81 pc economy gage
block set (Enco 630-4115)? I ordered one recently with the sale and
October 20% discount, and it seems pretty nice, especially for the
price.

It came with an inspection certificate claiming NIST tracability and
listing the size deviation from the reference standard for each block in
millionths by block serial number. Every block I've measured with my
digital micrometer so far has been spot on, which would be expected
since the blocks are supposed to be 10X more accurate.

The set certainly seems plenty accurate for my needs, but I'm curious if
the inspection certificate is legit or if every set has the same
certificate and serial numbers. If you have this set, please post the
set SN and a few block SNs and deviations.

Set SN 81PCS-1723
0.100" SN 61398 +4
0.500" SN 73231 -13
1.000" SN 79604 -1

I bought a set like that but in the end went for a 2nd hand British made
set with calibration certificate still in date. It a grade 2 set and the
uncertainty of measurement is given as +/- 0.000 005" upto 2" and +/-
0.000 01, the biggest deviation is the 3" slip at -27, most are much
smaller. The certificate notes the deviations are at the centre of the
blocks. I asked 2 people the day I bought them what I might expect from
Chinese ones and they mentioned issues of flatness and parllelism as
being likely ones even if the dimensions were as specified where measured.

No idea about their certificate authenticity but a company I work for
checked out the CE certificate on some Chinese made tablet PCs recently
and the testing house confirmed they were fake, same with the supplied
power supply.