1 milligram -100 gram twenty-one (21) piece Class 1 calibration weight set (PWB7228-1W), ASTM Shape, includes Report of Traceability and Certificate of Calibration.  Typical lead time is 7 to 10 business days from the date order is placed to shipping from NVLAP metrology lab located Arvada, Colorado.

These Class 1 Mass Standards provide the greatest precision we offer.  They are ideal for use as reference standards to calibrate other weights or for calibrating high-resolution analytical balances.  Class 1 weights are identical to E2 weights except for the nominal value markings.  E2 weights have no markings on the weights, many customers prefer the weights be marked with the nominal value.  The OIML E2 tolerance is approximately two times the precision of ANSI/ASTM Class 1.

Single-piece construction: Because the precise measurement of density can only be achieved using a single piece weight, all Sartorius weights are ASTM Type 1 single-piece weights.  These weights contain no air cavity or foreign adjusting material, thus providing the maximum mass stability.  In addition, it is an ASTM requirement that one-piece weights are used as standards and where mass stability is required.

A Choice of Preconfigured or Custom Weight Sets: Whether you choose a preconfigured weight set, or have a custom set made to meet your specific needs, be assured that all Sartorius weights are made of the highest quality materials.  Weight sets consist of flat weights in the 1mg to 500mg range and knob-style weights.

The mass standards produced by Sartorius today are designed to meet or exceed the standards of the American Society of Testing Materials (ASTM E617)

We offer a choice of 21 and 9 piece weight sets or individually weights ranging from 5kg to 1mg.  See the complete offering of calibration weights here.