ok( my $o = RFID::Serial::3M810->new( device => '/dev/ttyUSB0' ), 'new' );
-ok( my $inventory = $o->inventory, 'inventory' );
+ok( my @tags = $o->inventory, 'inventory' );
+diag dump @tags;
+ok( my $blocks = $o->read_blocks( $_ ), "read_blocks $_" ) foreach @tags;