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doubling and halving
small item storage
structural stability
1 doubler ring (2x scoring)
Grove - Ultrasonic Distance Sensor L1-Stationery & Teacher-L2-Whiteboards & Accessories-L3-Student Whiteboards doubling and halvingThe Ultrasonic Distance Sensor is an ultrasonic transducer that utilises ultrasonic waves to measures distance. It can measure from 3cm to 350cm with the accuracy up to 2mm. It is a perfect ultrasonic module for distance measurement, proximity sensors, and ultrasonic detector. This module has an ultrasonic transmitter and an ultrasonic receiver, so you can consider it as an ultrasonic transceiver. Familiar with sonar, when the 40KHz ultrasonic wave
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