Meta box checkbox won’t save

I found the answer now it was the way i was trying to save it this is what I done in the save function

    if( isset( $_POST[ 'ck_sale_item' ] ) ) {
    update_post_meta( $post_id, 'ck_sale_item', 'on' );
} else {
    update_post_meta( $post_id, 'ck_sale_item', 'off' );
}

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