"Have the oranges had too much frost?"
The T-TEC 6-1E Data logger for outdoor use can be set so that it tells whether the orange orchard has suffered too much frost for the oranges to be accepted for export. The alarm thresholds & grace periods can be set in the data logger, which will then beep if the frost has been too hard over night. The data logger can automatically reset itself once daily.
"Is this block of land suitable for planting of vines?"
The T-TEC 6-1E Data logger is suitable for outdoor use and can monitor for a year if set to log once an hour. For the best readings some shade should be provided: the canopy of a tree or an upturned bucket will do.