Monstera brown spots and yellow outline help

I recently got a monstera a couple months ago. She’s been doing well so far, but recently one of the leaves has been developing brown spots and the outside is turning yellow. Does anyone know what’s going on? Is there something I can do to reverse this, is it a sign of something bigger (and possibly worse), or is it just something that happens to so leaves. All the other ones seem to be doing good to me, and she has a solid amount of indirect sunlight afforded to her. 
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    Paris Lalicata Hi Arvid! It looks like it could be due to over watering. Do you allow the soil to dry out completely? There's also a chance the plant isn't receiving enough light to take up water depending on how far it is from the window! Therefor, I would either increase the plants exposure to bright indirect light or watering less frequently!
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      Arvid Samuelson Hi Paris,

      Great thank you! I’ll give a go at watering it less. How do I accurately see if the soil is dried out completely from top to toe? There’s no hole at the bottom of the vase, any easy tricks?
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        Paris Lalicata I would recommend using a moisture meter you can find these for like $10 at most garden centers or online! I think this is the most easiest wet to test for moisture. Otherwise you can try the weight method since plants are more heavy when freshly watered vs bone dry. Or sticking a chopstick down into the soil (like the bakers method) as wet soil will stick to it and be more muddy, whereas dry soil wouldn't really stick or be more crumbly!