Precision Analytical Masses (Ultra Class)

Troemner Precision Analytical Masses (Ultra Class) is recognized by the National Institute of Standards and Technology (NIST), the American Society for Testing and Materials (ASTM) and the International Organization of Legal Metrology (OIML) for its precision weights and mass standards. The weights can range from the very precise, highly polished one and two-piece stainless steel weights to 5,000 lb cast-iron weights.

To maintain lab precision, it is necessary to perform routine calibrations and verifications using Troemner™ analytical masses and calibrating weights.

Like ASTM classes 0,1,2,3, these ultra class weights meet or exceed specifications as defined in the ANSI/ASTM E617 standard. Troemner™ UltraClass weights are the most precise two-piece weights offered, with a weight tolerance 50% greater than ANSI/ASTM Class 1 weights.

UltraClass weights are unique in that they offer extremely high precision while still maintaining the advantage of a two-piece construction (like ASTM classes 0-4). One-piece constructions are often needed to be replaced or grinded and polished manually to make adjustments due to the single, uniform piece of raw material.

These Troemner™ weights are highly resistant to corrosion thanks to an alloyed stainless steel available only to Troemner™ and among the finest in state primary standards for manufacturing. They are manufactured from the highest quality stainless steel alloy--blending controlled density, low magnetic susceptibility, stability and anti-corrosion.

These precision weights are 1 g and larger, and are produced from two pieces of material: the body of the weight and the knob of the weight. This lifting knob is specifically designed for use with forceps, tweezers, and other lifting devices. The knob has a thread that screws directly into the body and is tightened. The weights are easy to recognizable as the top of the weight is marked with a nominal value.

Troemner™ is the only private mass metrology laboratory in the world accredited for E1 measurements with uncertainties at 1/3 the E1 tolerance. The company is home to a seasoned staff of metrologists and high-end calibrators offering the most precise balances and finest mass comparators on the market.

Key Features

  • ASTM internationally recognized weight specifications
  • Two-piece construction despite high precision
  • All surfaces polished to a mirror-like finish
  • Troemner Alloy 8 Stainless Steel, fine and specific to Troemner weights
  • Tolerances and design restrictions for each class 
  • Slightly recessed weight bottoms to limit contact with water
  • Precise weight heads and necks allowing for sure grip to forceps or weight lifters

Filter
Item Mass Unit of Measure Price Purchase
EF7091E
30390176
10 mg Each
$95.95
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EF7099T
30390189
20 g Each
$96.95
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EF7091F
30390175
5 mg Each
$95.95
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EF7099W
30390188
10 g Each
$96.95
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EF7091H
30390172
1 mg Each
$95.95
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EF7099K
30390192
100 g Each
$139.95
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EF7091D
30390177
20 mg Each
$95.95
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EF7091B
30390181
200 mg Each
$95.95
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EF7097F
30390184
1 g Each
$96.95
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EF7091C
30390179
50 mg Each
$95.95
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EF7099Z
30390187
5 g Each
$96.95
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EF7099P
30390191
50 g Each
$114.95
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EF7091G
30390173
2 mg Each
$95.95
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EF7097C
30390185
2 g Each
$96.95
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