Line/Electricity Detector and Lighting 3 in 1 auto repair tool is an economy and multi-function repair tool. It can used to do line detect, electricity detect. And because it have led bulb design, can used for lighting.
Hello Ms. Norah,
They have the same function. The only difference between them is just the appearance color. SO103 is yellow and SO103-B is red. Pls feel free to let me know if you have any more questions.