Joke, Chrony in fluorescent light Just as bad outdoors in sunlight. Whats the point in an inaccurate chrono.
Same applies to newer Skans, says mine is doing 300ft/sec shooting back to 8ft through a small hole and shielded from above light.
The Combro beats hands down for accuracy even though knackered two up.

Theres only one to buy CED M2 with Infra Red setup, use in any light so not affected by changing conditions. Add to that the clock runs 12 times quicker than all other chronos.