The GYZJ-069 is a soft aluminium test and calibration disk for use with the Barcol 935 Impresser. This is the same metal as the GYZJ-078 lower reference standard for the 934-1 impresser (marked 43-48).
The GYZJ-069 is NOT the same as the GYZJ-250 test disk specified for the 934-1 impresser (marked 87/89). If used with a 934-1 impresser the GYZJ-069 disk should give readings in the range of 43-48.
Certified calibration disks are available to special order.
© Nigel Clegg Associates, Hardwick Road, Sedgefield, County Durham, TS21 2AL