So which type should you buy. Radio telemetry has two major advantages over dataloggers in that it provides live data and does not require someone to physically collect the units. Where radio fails, dataloggers are the better option. Dataloggers are more cost effective where only a few points of measurement are required as the radio systems require a receiver which costs several hundred pounds and means a higher price per point of measurement for the first few units. If staff time is at a premium than radio telemetry is the more sensible option as it is less labour intensive.
Light measurements are readily available on radio systems but still rare on datalogger systems.