Comparison Tesla Weld 30.997 vs Forte MC-9000

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	Tesla Weld 30.997	Forte MC-9000
	from $72.08 Outdated Product	from $40.62 up to $48.00 Outdated Product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)	100x55 mm	100x53 mm
Filter cartridge dimensions (WxH)	110x90 mm	110x90 mm
Filter cartridge thickness		10 mm
Optical sensors	4	4
Operating temperature	-5 – 70 °C	-5 – 55 °C
Helmet weight	495 g	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	plain (shades of green)	plain (shades of green)
Design features	controls outside	controls outside
Color
Added to E-Catalog	february 2016	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.

Operating temperature

The range of ambient air temperatures at which the mask is guaranteed to be able to function normally. This parameter is especially important for "chameleons" (see "Functions"), because. the performance of the automatic filter directly depends on external conditions (in particular, at low temperatures, the response time may increase).