{"id":5351,"date":"2011-07-18T06:09:03","date_gmt":"2011-06-12T13:25:24","guid":{"rendered":""},"modified":"2011-07-18T06:41:56","modified_gmt":"2011-07-18T00:41:56","slug":"casio-fx-115-so","status":"publish","type":"post","link":"https:\/\/kk.org\/cooltools\/casio-fx-115-so\/","title":{"rendered":"Casio FX-115 Solar Calculator"},"content":{"rendered":"<p>I bought my Casio FX-115 Solar Calculator 25-years ago, probably in Malaysia. It replaced my then aging Texas Instruments calculator. The thing I like most about it is that it doesn&#8217;t need batteries. None. You can pull it out of a drawer after a year and it just works. No fretting about whether you left it on or not, and I&#8217;ve never needed to replace anything.<\/p>\n<p>The new ones come with a dual solar and battery combo called &#8220;solar plus&#8221;. Don&#8217;t be fooled. The closest new equivalent is probably the Casio FX-260 Solar ($9.99), but that model doesn&#8217;t have some of the features of the FX-115.<\/p>\n<p>As far as calculations go, it has pretty much all anyone would need. It has a nice friendly EXP button for scientific notation and infinite levels (18) of parenthesis. It converts and computes in alternate number bases (binary, octal and hex) and does linear regression.<\/p>\n<p>The plastic is a bit scuffed after riding around in my backpack all these years, but it&#8217;s been wet and recovered. It also gets really sluggish when used outside in sub zero (C) weather. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Math without batteries<\/p>\n","protected":false},"author":33,"featured_media":0,"comment_status":"open","ping_status":"0","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[32],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/kk.org\/cooltools\/wp-json\/wp\/v2\/posts\/5351"}],"collection":[{"href":"https:\/\/kk.org\/cooltools\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kk.org\/cooltools\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kk.org\/cooltools\/wp-json\/wp\/v2\/users\/33"}],"replies":[{"embeddable":true,"href":"https:\/\/kk.org\/cooltools\/wp-json\/wp\/v2\/comments?post=5351"}],"version-history":[{"count":0,"href":"https:\/\/kk.org\/cooltools\/wp-json\/wp\/v2\/posts\/5351\/revisions"}],"wp:attachment":[{"href":"https:\/\/kk.org\/cooltools\/wp-json\/wp\/v2\/media?parent=5351"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kk.org\/cooltools\/wp-json\/wp\/v2\/categories?post=5351"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kk.org\/cooltools\/wp-json\/wp\/v2\/tags?post=5351"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}