Several years ago I purchased an old barn (platform) scale at a farm
auction.  I have used it since then to keep records of one hive in my yard.
The platform is big enough to accept the bottom board.  I usually choose a
mid strength colony and use the daily readings to determine timing of honey
flows etc.  Best day to day increase was 17 pounds.  The scale cost $5 in
1975.  Likely be more now.
                                        Bob Darrell
                                        Caedon Ontario Canada
                                        80W 43,50'N