Stainless Steel E1 Polished Solid Stainless Steel Calibration Weight supplied in a felt lined wooden box.

Tolerance +/- 0.025mg

If you want the test weight verified & certificated select DAkkS Certification. The Cert is included in the price, one certificate will cover a batch of weights providing they are on the same order and for the same customer.  

(DAkkS is the German equivalent to UKAS and is recognised by UKAS.)