solar thermometer: under NSF testing now,ABS case high accuracy,200LUX solar energy works ON/OFF,C/F bottom,battery support solar digital thermometer:solar energy supplybig LCD displaytemperature range;-50~150C/Fdisplay normally in poor light statussensor lenght:1.2meterupdate time:1 to 10 secondspower supply:Non-crystalline silicon solar wafer supply or battery