Comparison Tesla Weld 30.999 vs Forte MC-9000

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	Tesla Weld 30.999	Forte MC-9000
	from $80.92 Outdated Product	from $40.62 up to $48.00 Outdated Product
all specs only differences
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Type	chameleon helmet	chameleon helmet
Specs
Light filtering levels	4 DIN	4 DIN
Min. degree of darkening	5 DIN	5 DIN
Max. degree of darkening	13 DIN	13 DIN
Protection from UV/IR	16 DIN	16 DIN
Turn-on time	33.3 ms	33.3 ms
Filter class		1/1/1/2
Filter viewing area (WxH)		100x53 mm
Filter cartridge dimensions (WxH)	114x133 mm	110x90 mm
Filter cartridge thickness		10 mm
Optical sensors	4	4
Operating temperature	-5 – 55 °C	-5 – 55 °C
Helmet weight		460 g
Filter functions
Darkening adjustment	external mechanical	external mechanical
Sensitivity adjustment	external mechanical	external mechanical
Delay time adjustment	external mechanical	external mechanical
Grinding mode	external mechanical activation	external mechanical activation
Colour rendering	standard (shades of green)	standard (shades of green)
Design features	controls outside	controls outside
Color
Added to E-Catalog	october 2017	november 2015

Filter class

Class is a complex indicator that determines the overall quality of the light filter in a chameleon mask (see "Type"). The class is indicated by 4 numbers, each of which describes a specific optical parameter. So, the first number indicates the overall clarity and lack of distortion; the second is the degree of light scattering; third — uniformity of blackout (presence/absence of visible blackout spots); the fourth is the angular dependence (how much the filter brightens when the angle of view deviates from the perpendicular). In each case, the larger the number, the worse this parameter is. The perfect indicator is considered to be 1/1/1/1, but in fact it is very difficult to achieve an perfect angular dependence, and there is no need to. Therefore, an indicator of 1/1/1/2 is considered quite sufficient even for a high-end professional filter.

Filter viewing area (WxH)

The size of the transparent part of the light filter — the "working window", the area through which the welder sees the place of work. A larger working window provides ease of use and a wide field of view, but it significantly affects the cost of the mask and somewhat reduces the strength of the light filter.

Filter cartridge dimensions (WxH)

The overall dimensions of the light filter for which the mask is designed, taking into account the working window, protrusions for mounting, batteries, sensors and other structural elements. This indicator is especially important for models that are not equipped with light filters: without knowing the size, it is very difficult to choose the right cartridge. In other cases, data on the size of the cartridge is needed mainly when looking for a replacement for a failed colour filter.