上海四达电子SD-07B卡片式数字万用表是一款轻便实用的电子测量工具。它采用卡片式设计，体积小巧，便于携带和操作，非常适合技术人员、电子爱好者和维修人员在各种场合使用。

该万用表具备多种测量功能，能够测试直流和交流电压、电阻，并支持二极管测试和连续性检测。其直流电压测量范围为20V和200V，交流电压测量范围为200V和500V，电阻测量范围涵盖200Ω、20KΩ和2MΩ。此外，它还配备了2000计数的LCD显示屏，能够清晰地显示测量结果。

SD-07B万用表还具备一些实用的功能，如最大数据保持功能，方便用户记录测量的最大值；低电量显示功能则能及时提醒用户更换电池。它采用手动量程切换，用户可以根据测量需求选择合适的量程。

该万用表的外观设计人性化，操作简单，使用方便。其机身尺寸为115mm×58mm×12mm，重量仅为84克，携带十分轻松。此外，它还配备了标准的测试线和说明书，方便用户快速上手。

The Shanghai Sida Electronic SD-07B Card Digital Multimeter is a compact and portable electronic measurement tool. Designed in a card size, it is lightweight and easy to carry and operate, making it suitable for technicians, electronics enthusiasts, and repair personnel in various settings.

This multimeter features a range of measurement functions, including the ability to test DC and AC voltage, resistance, as well as diode testing and continuity detection. It has a DC voltage measurement range of 20V and 200V, an AC voltage measurement range of 200V and 500V, and a resistance measurement range covering 200Ω, 20KΩ, and 2MΩ. Additionally, it is equipped with a 2000-count LCD display that clearly shows measurement results.

The SD-07B multimeter also includes practical functions such as a maximum data hold function, which allows users to record the maximum measured value, and a low battery display that promptly alerts users to replace the batteries. It uses manual range switching, enabling users to select the appropriate range according to their measurement needs.

The design of the SD-07B is user-friendly, with simple operation and convenient use. The device measures 115mm×58mm×12mm in size and weighs only 84 grams, making it very easy to carry. It also comes with standard test leads and a manual to help users get started quickly.