日本奥普士PT-305L手持式测温仪是一款小巧便携、操作简便的非接触式测温工具。它采用口袋型设计，便于携带，适用于多种场景，如汽车引擎安检、电机线路检测、铁道运输轴承检查以及低温冷藏品检测等。

该测温仪的测定温度范围为-40℃至510℃，能够满足多种环境下的温度测量需求。其测定区域范围为D:S=10:1，检出波长为8～14um。在测量精度方面，PT-305L的表现较为出色，测定精度为读取值的±1％或2℃（ε＝0.95），再现性为读取值的±1℃。此外，该设备还具备℃/℉切换功能，用户可以根据需要选择不同的温度单位。

PT-305L的显示部分带有背光功能，即使在光线较暗的环境中也能清晰读取测量数据。它使用单3干电池×2只供电，电池寿命约30小时。在物理特性方面，该设备的尺寸为140mm×56mm×37mm，重量仅为180g，轻巧的设计使其长时间使用也不会感到疲劳。

The Japanese OPTEX PT-305L handheld thermometer is a compact and easy-to-use non-contact temperature measuring tool. With its pocket-sized design, it is convenient to carry and suitable for various applications, such as automotive engine inspection, electrical circuit detection, railway bearing inspection, and low-temperature refrigerated product inspection.

The thermometer has a wide measuring range of -40℃ to 510℃, which can meet the temperature measurement needs in various environments. It has a measuring area range of D:S=10:1 and a detection wavelength of 8～14um. In terms of measurement accuracy, the PT-305L performs well, with a measurement accuracy of ±1％ of the reading or 2℃ (ε＝0.95), and a reproducibility of ±1℃. Additionally, the device features a switchable display between ℃ and ℉, allowing users to choose their preferred temperature unit.

The PT-305L also has a backlight display, which ensures clear reading of measurement data even in low-light conditions. It is powered by two AA batteries and has a battery life of approximately 30 hours. In terms of physical characteristics, the device measures 140mm×56mm×37mm and weighs only 180g, making it lightweight and comfortable to use for extended periods.