New deals from English Heritage, East Devon District Council and Cambridgeshire County Council followed the show in Windsor last September.
The firm carried out on-site testing of all of English Heritage's powered tools, equipment and plant from brushcutters to ride- on mowers at 12 of its sites.
Fivesquared, a division of Earlsmere ID Systems, tested each item of kit on conditions for hand-arm and whole-body vibration together with noise output.
The results went into a report on individual vibration levels for each item, usage times and health-and-safety points, said a representative for the firm.
"All gear tested is now safety tagged with specific data including legally permitted usage times. All supervisors and managers will do our Level 2 training course."
The contract for Cambridgeshire County Council involved whole-body vibration testing on a range of ride-on triple mowers, rotary mowers and tractors.
Meanwhile, Fivesquared tested equipment at East Devon District Council, which is using Earlsmere's Daily Vibration Log Books to record daily usage times.