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Great value temperature display measures
red and yellow)
These pattern cards and beads help to develop logical thought to re-create complex patterns
It is tuned to concert pitch so you can play along with 'Play your Ocarina' music books and CDs and with other musical instruments
Provides sequencing
Soil Moisture Logger X168577 Great value temperature display measuresThis Edu Logger sensor is based on measuring the vacuum pressure in a tensiometer. A tensiometer is a closed tube with a special ceramic part in its end. The tensiometer is filled with water and put in the soil. If the soil is dry, water goes out by diffusion through the ceramic holes and vacuum pressure is created in the tensiometer. If the soil is wet, the vacuum in the tensiometer pulls water into the tensiometer and the vacuum decreases. This is