What aspect of a wholesale measuring device affects its performance at varying temperatures?

The performance of a wholesale measuring device at varying temperatures is significantly influenced by the temperature compensator. A temperature compensator is designed to adjust the measurements of a device to account for fluctuations in temperature. Many materials expand or contract when subjected to temperature changes, which can lead to inaccuracies in measurement. The compensator works to offset these variations, helping to ensure that the measurements remain accurate regardless of temperature changes.

While other aspects, such as casing material, size, and calibration frequency, can impact a device's performance, they do not directly address the thermal effects that occur during temperature fluctuations. The temperature compensator specifically targets this critical factor, making it the most relevant choice in the context of temperature effects on measuring devices.