Node+MongoDB: find in collection

I just don't know why it's not working(( val.instruments is undefinded.

function getInstruments(callback) {
    db.collection("settings", function(error, settings) {
        settings.find({ "settings" : "settings" }, function (err, val) {
            console.log('from getInstruments ' + val.instruments);
            if (val.instruments==undefined) {
                callback("");
            } else {
                callback(val.instruments);
            }
        });
    });
}

scheme:

{
    "_id": {
        "$oid": "508677a3e5089a6df291631a"
    },
    "settings": "settings",
    "instruments": [
        "1",
        "2",
        "3"
    ]
}

returns:

node app.js:
from getInstruments undefined

Any suggestions? Thanks.

UPD: Modified code to:

function getInstruments(callback) {
db.collection("settings", function(error, settings) {
    settings.find({ "settings" : "settings" }).toArray(function(err, docs) {
       console.dir(docs.instruments);
    });
});
}

Result:

[ { _id: 508677a3e5089a6df291631a,
settings: 'settings',
instruments: [ '1', '2', '3' ] } ]

Changed to:

function getInstruments(callback) {
    db.collection("settings", function(error, settings) {
        settings.find({ "settings" : "settings" }).toArray(function(err, docs) {
           console.dir(docs.instruments);
        });
    });
}

Result:

undefined

How it can be?