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Micro-Trak's Calc-An-Acre II with wheel sensor is an economical way to monitor speed, area, and distance.

Calc-An-Acre custom kit allows you to add either a radar or GPS ground speed sensor. Sensors are sold separately.

The Astro 5 GPS Receiver is based on a 5 Hz GPS receiver for faster, dynamic response to speed changes. For use with the older Calc-An-Acre/FT/SOM 2-pin adapter.

The Astro II GPS is based on accurate yet economical 1 Hz GPS receiver. For use on Micro-Trak older Calc-An-Acre/FT/SOM 2-pin adapter.

Micro-Trak's Run/Hold switch will automatically stop the distance and area counting functions of your equipment. For use on the Calc-An-Acre II, Flow-Trak II, MT-3405F(D) II, and MT-9000.