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About product and suppliers:
            40 mains tester pen products are offered for sale by suppliers on Alibaba.com, of which testing equipment accounts for 30%. 

A wide variety of mains tester pen options are available to you, such as auto testing machine. You can also choose from electronic mains tester pen, as well as from analog and digital mains tester pen

There are 35 suppliers who sells mains tester pen on Alibaba.com, mainly located in Asia. The top countries of suppliers are China, Hong Kong S.A.R., from which the percentage of mains tester pen supply is 85%, 14% respectively.