_id datetime   val_raw   val_raw_value   val_type   dev_tag   val_description   dev_site   val_cal   val_offset   dev_type   dev_label   dev_category   dev_powersource   val_calibrated   geolocation   colspacer
datetime val_raw val_raw_value val_type dev_tag val_description dev_site val_cal val_offset dev_type dev_label dev_category dev_powersource val_calibrated geolocation