How impervious is it to water and shock?
The unit is sealed to IP54. This means that it will withstand dust, and water splashes. It has been used in The Grind, a very muddy, tight cave passage in Yorkshire, and survived quite happily. It is not fully waterproof – if that is required then a simple zip-lock bag will be quite effective, and it will still work inside it. I have not formally tested it’s resilience to shock. The case is ABS plastic, which is quite rugged. The only moving part is actually the switch. The components are all rated to 10000g. I have dropped a couple of tehm small distances (~1m) without any problems. They are probably as rugged, if not more so than traditional instruments. I would still recommend handling them with care.
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