Precision Analytical Masses (ASTM Class 4) 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 weights meet or exceed specifications as defined in the ANSI/ASTM E617 standard. The ASTM Class 4 is used to calibrate semi-analytic balances and is an appropriate size for student use. These Troemner™ weights are highly resistant to corrosion thanks to an alloyed stainless steel and among the finest in state primary standards for manufacturing.

The class 4 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.

Key Features

• ASTM internationally recognized weight specifications
• ANSI/ASTM Class 4 weights have a satin like appearance and finish
• Alloy 8 Stainless Steel
• Tolerances and design restrictions for each class 
• Sizes ranging from 10 g to 30 kg
• Slightly recessed weight bottoms to limit contact with water
• Can be used for calibration of semi-analytical balances and for student use
• Precise weight heads and necks allowing for sure grip to forceps or weight lifters