Precision Instruments for Measuring Time, Weight and Force

The choice depends on the capacity, that is the maximum weight the scale can take, and on the precision needed. For weighing parcels or heavy materials you need platform scales, while small quantities are covered by electronic bench scales. The mechanical 200-300 kg platform scale in the catalogue is designed for heavy loads. Always check the capacity shown on the data sheet.

Scales used to weigh goods for commercial purposes must comply with metrological regulations, and in many cases periodic verification is required. A scale for domestic or laboratory use has different requirements. Before using it for pricing or trade calculations, check that it is suitable for the use and that it carries the verification required by law.

An electronic scale uses a sensor and shows the weight on a digital display, with more precise readings. A spring scale works without power, with a pointer that moves across a dial, and suits quick, approximate weighings. For work on site or in the workshop, a spring scale avoids dependence on batteries.

Brass and cast iron weights are reference masses used to check the calibration of scales and for checks in the workshop or laboratory. The material determines the mass for a given volume, and the surface finish. A reference weight should be kept clean and handled carefully, without touching it with dirty hands, so that its mass is not altered.

The digital optical tachometer measures the revolutions per minute of a rotating part: you aim the sensor at a reflective mark applied to the rotating part, and the reading appears on the display. It is used in workshops to check motors and machines. Keep a safe distance from moving parts and never bring your hands close to the measuring point.

The digital hardness tester measures the hardness of metals and other materials to check that they meet the specification of the part. It is used in workshops, in quality control and in test laboratories, and serves to compare a part with a known reference. For reliable readings, the tester must be calibrated with the calibration blocks specified by the manufacturer.

Place the scale on a stable, level surface, away from vibration and draughts. Zero the platform before each weighing and clean the platform without wetting the display. Replace the batteries when the display dims, and keep the scale in a dry case when it is not in use.