This Byomic Junior Refractor telescope 60/700 is very suitable for the beginning amateur. The telescope can be brought with you easily thanks to the handy case. In this way you you can also observe the celestial bodies outside of your own home. The characteristics of this refractor telescope are very good to observe the moon, but it is also very suitable to see other celestial bodies. For this you receive several oculars to achive the necessary enlargement.
Attention: With this telescope you will receive a LED-finder. This makes it even easier to aim on an object you want to see. A red dot shows where you are aiming.
Definition: The Water Column of a Tent
The water column indicates the maximum water pressure that a tent fabric can withstand.
A water column of 1,500 mm means that the tent fabric can withstand the pressure
of a 1,500 mm (1.5 meter) high column of water before water penetrates the fabric.
The higher it is, the more waterproof the tent material is.
Waterproofness
The water column is also a unit of measurement to measure the watertightness e.g.
B. of technical fabrics (tents, functional and rainwear).
DIN EN ISO 811:2018
regulates the method for determining the resistance to the penetration of water.
The following “hydrostatic water pressure test” must be carried out: The outside
of the material is exposed to the water. The water pressure starts at zero, the
water column rises by 100 mmWC or 600 mmWC per minute, depending on the standard.
The time is measured until the third drop can be seen on the inside. The pressure
that is acting at this point in time is then given in millimeters of water column.
Top tents are considered waterproof from 1500 mm
and tent floors from 2000 mm according to DIN.
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