Impact or Shock Recorders for Transformer Monitoring
Impact recorders are equipments that log shock value and the time it occurred. Impact reorders are used to monitor shipments where concealed damage is a key concern like Transformers. The purpose of using Impact Recorders for monitoring Transformers is:

Transformer Logistics Monitoring - Shock and Impact Recorder
This blog briefly provides you an idea about the level of shocks a transformer shipment experiences in different modes of transportation, recording them using a shock recorder and analysis of shock data. You can also use it for analysis of impact damage in other kind of shipments too.