try

#!/usr/bin/env node

var temper1x = require("temper1x")
var program = require('commander')
var log = function(msg) {
  if (program.verbose) {
    console.log(msg)
  }
}

var devices = temper1x.getDevices()
program
  .option('-p, --path <path>', 'Set a path to the temper1 device. Detect the path by running the detect command.', '')
  .option('-s, --scale [scale]', 'Say farenheit if you dont want celsius.', 'celsius')
  .option('-v, --verbose', 'Turn on verbose mode')
  .parse(process.argv)

temper1x.readTemperature(program.path, function(err, value) {
  if (err) {
    log(err)
    process.exit(1)
  }
  if (program.scale === 'farenheit') {
    value = (value * (9/5)) + 32
  }
  console.log(value)
  process.exit(0)
})