Calculator Policy

Only the following types of calculators are allowed:

Texas Instruments BA II Plus, (both versions) including the BA II Plus Professional
Hewlett Packard 10B II, 10 IIB+, 20B, 12C, including the HP 12C Platinum and the Anniversary Edition

http://m.jd.com/product/1759914810.html?resourceType=jdapp_share&resourceValue=CopyURL&utm_source=iosapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=CopyURL

我用的这个，还有很多别的型号，这款好像是基础款，还有更专业一点的