Control the refill and power setup
Use the instructed solution and fill level for each sample. Record whether the test uses new disposable cells or a fully charged supplied battery. Two machines tested with different liquid dilution or battery condition cannot be compared fairly by bubble output alone.
Write the operating sequence
Record the filling method, switch position, time to first output and behavior after a pause. Check whether the machine must stay level and whether solution drains toward an electrical compartment during normal handling. Keep a short video with the sample reference and date rather than an unlabelled promotional clip.
Observe interruptions and cleanup
Stop and restart the machine using its normal controls. Follow the stated emptying and cleaning procedure, then inspect the reservoir closure and accessible residue. If instructions do not explain storage after use, raise that question before artwork approval.
Use the observations to choose a version
Record findings as conditions and observations, not invented performance guarantees. For example, identify the actual solution used and the observed operating period. Confirm which accessories and liquid containers are included in the quotation so the ordered pack matches the test setup.
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