Thermometer Merk Hisamatsu HS-66

Earth thermometer
With a view models as follows :
– Model HS-66. Temp. range -20 to 50°C. Length of tube 50 cm
– Model HS-66. Temp. range -20 to 50°C. Length of tube 100 cm
– Model HS-66. Temp. range -20 to 50°C. Length of tube 200 cm