The Scale Master Pro and Scale Master Pro SE replaced the Scalemaster Classic and Scalemaster II. The Ultra Scalemaster Pro by Calculated Industries has limited features of a planimeter. Use the Scale Master Pro or Scale Master Pro SE for measuring blueprints, architectural plans, engineering plans or any set of scaled drawings where distance or simple areas need to be calculated. The difference between the Scalemaster Pro and the Scalemaster Pro SE is the Scale Master Pro SE is able to download data to any windows program using the Scale Master Pro SE interface kit. The Scale Master Pro SE is also available with the interface kit at a discounted price. The Scale Master Pro has 72 built in scales and the ability to program additional user defined scales. The Scale Master Pro SE has 91 built in scales and ability to program additional user defined scales. Both the Scale Master Pro and Scale Master Pro SE include architectural scales, engineering scales, metric scales and mapping scales. The Scalemasters are excellent for quoting and is used in building, construction, landscaping, gardening, electrical work or any field where you need a fast accurate tool for estimating the cost of a job. Need a tool to quickly quote and estimate for building and construction then look at the Calculated Industries Scale Master Pro and Scale Master Pro SE, or Ultra Scale Master Pro.