Altimeter for measuring tree Blume Leiss BL7 Scale Hypsometer Test, Measurement

Description

For sale, a Blume-Leiss BL7 altimeter / scale hypsometer, by,  Made in India.
It measures tree heights through the elevation angle between the observer is the measured points on the tree.
Despite originally designed to measure tree heights it can potentially be used to measure any object's height.
The height measurements can be read directly from the altimeter based on the fixed baseline distances on the device (15 m, 20 m, 30 m, 40 m).
It also supports percent/degree conversions and degree/slope correction factors on the side of the device.
This BL7 model provides a single release button and an indicator.
To begin the measurement of the tree height, determine the baseline distance between the tree and the observer.
Target the highest point of the tree.
Read and record the measured value.
Press the release button to free the needle and measure the lowest point.
The measured values of the highest and lowest points can be used to determine the tree's height.
Product Weight - 410 Gram
Product Dimension - L x 14 cm B x 14 cm H x 3 centimeter
The Blume-Leiss BL7 altimeter / scale hypsometer comes with a carrying case to keep it protected while it is not being used.
Please, feel free to ask any questions you might have about this listing.
Thank you for looking!