タブレット用のUAはPC用に設定。

    #set $mobile "";

    #if ($http_user_agent ~* '(Android|(blackberry|\bBB10\b|rim tablet os)|(PalmOS|avantgo|blazer|elaine|hiptop|palm|plucker|xiino)|(Symbian|SymbOS|Series60|Series40|SYB-[0-9]+|\bS60\b)|(Windows CE.*(PPC|Smartphone|Mobile|[0-9]{3}x[0-9]{3})|Window Mobile|Windows Phone [0-9.]+|WCE;)|(Windows Phone 8.0|Windows Phone OS|XBLWP7|ZuneWP7)|(\biPhone.*Mobile|\biPod|\biPad)|MeeGo|Maemo|(J2ME/|\bMIDP\b|\bCLDC\b)|(webOS|hpwOS)|\bBada\b|BREW)') {
    #    set $mobile "@mobile";
    #}

    #if ($http_user_agent ~* '(iPad|Android((?!Mobile).)+$)') {
    #    set $mobile "";
    #}

    #if ($http_user_agent ~* '(DoCoMo|J-PHONE|Vodafone|MOT-|UP\.Browser|DDIPOCKET|ASTEL|PDXGW|Palmscape|Xiino|sharp pda browser|Windows CE|L-mode|WILLCOM|SoftBank|Semulator|Vemulator|J-EMULATOR|emobile|mixi-mobile-converter)')    #{
    #    set $mobile "@ktai";
    #}

    #if ($http_user_agent ~* '(iPhone|iPod|Opera Mini|Android.*Mobile|NetFront|PSP|BlackBerry)') {
    #    set $mobile "@mobile";
    #}

         ## UA判定
        set $mobile '';

        if ($http_user_agent ~* '(DoCoMo|J-PHONE|Vodafone|MOT-|UP\.Browser|DDIPOCKET|ASTEL|PDXGW|Palmscape|Xiino|sharp pda browser|Windows CE|L-mode|WILLCOM|SoftBank|Semulator|Vemulator|J-EMULATOR|emobile|mixi-mobile-converter)')     {
            set $mobile '@ktai';
        }

        if ($http_user_agent ~* '(iPhone|iPod|incognito|webmate|Android.+Mobile|dream|CUPCAKE|froyo|BlackBerry|webOS|s8000|bada|IEMobile|Googlebot\-Mobile|AdsBot\-Google)') {
            set $mobile '@mobile';
        }

        if ($http_user_agent ~* '(iPad|Android((?!Mobile).)+$)') {
            set $mobile '@tablet';
        }
        # UA判定ここまで

Androidタブレット判定用

Mozilla/5.0 (Linux; Android 4.3; Nexus 7 Build/JSS15Q) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.72 Safari/537.36

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