Questions from the Gallery

No. Material, construction, condition, past environment and deterioration mechanism all matter. A salt-contaminated ceramic, a painted wooden panel and a photographic negative may call for different approaches. Establish requirements with a conservator rather than applying a universal percentage. Our humidity essay explains why exposure history and duration matter.

There is no fixed number. Begin with a survey and clear questions, then compare representative room positions with relevant cases or vulnerable zones. External walls, glazing, doors and lighting can create local differences. A short pilot study helps identify meaningful locations before a larger purchase. Record why each sensor is there and review the arrangement when displays change.

Choose an interval that resolves the events you need to understand, considering response time, battery life, storage and review capacity. A seasonal survey and a door-opening investigation need different detail. An instrument that stores hourly averages may hide brief events even if it samples more frequently internally. Confirm how exported values are produced.

Wireless describes data transmission, not accuracy. Calibration, verification, placement and maintenance remain necessary. Check what happens when the network is unavailable: some loggers retain readings locally while others depend on a live connection. Test battery warnings and export your records in a usable format. A reliable radio link cannot compensate for a drifting humidity element.

Not by itself. Check the instrument, event duration, surrounding records and material vulnerability before drawing a conclusion. Handling a sensor or opening a case may create a brief excursion. A sensor fault is also possible. Investigate promptly when the consequences could be serious, but do not equate one unusual value with a confirmed change in condition.

Not reliably without comparison. Enclosure leakage, buffering, contents and lighting can create different conditions. Pair an inside-case instrument with a room reference where appropriate and document both positions. An enclosure that moderates one kind of fluctuation can still develop local heating or accumulate internally emitted pollutants.

Humidity and temperature records can inform risk assessment, but do not establish whether mould is present or will develop. Duration, surfaces and local conditions matter. A distant room sensor may miss a damp surface or stagnant pocket. If mould is suspected, follow your institution's health, isolation and conservation procedures rather than disturbing the object to investigate informally.

Not without a validated control strategy and clear responsibility. Monitoring and control have different roles; abrupt correction can create new problems. Define thresholds in context, check sensor reliability and agree who investigates each alert. Some incidents require immediate emergency action, while others call for verification and a measured review with facilities and conservation staff.

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