1. Introduction:

Hello! First of all, let me thank you for buying our thermometer, I hope you like it. The following instructions are designed to explain how to set up your thermometer and use it.

These instructions assume that you’ve already finished building your kit, and that you now have a fully-assembled thermometer. If not, please see the assembly guide.

2. Safety Elves:

Before we do anything, please read this safety information. We all tried very hard to make the thermometer as safe as possible for the everyday family. But just in case, here are the safety risks that you might want to know about.

The kit: If you haven’t assembled your kit yet, please keep it out of reach of babies or small children. The bags contain small parts, which could be considered a choking hazard. Just keep the kit far out of their reach, especially if your little one is at the ‘grabbing age’.

Whilst building: The kit itself is safe enough to build. Anybody who knows what they’re doing with a soldering iron should be okay. However, you might want to wear a mask while sanding the case parts, if you are easily irritated by/allergic to inhaling fine dust or other irritable substances. This dust could cause headaches/sickness over a long period of time. If you feel the symptoms coming on, then wear a mask, for your own sake.

The thermometer: Once built, the thermometer should be 100% safe for the everyday household. The USB 5V input is fused with a fusible resistor which is designed to go open-circuit safely when overloaded. If your thermometer does anything odd, or emits any burning smells, switch it off immediately and contact Lasermad at once (tony at

Please keep any wires connected to the thermometer out of reach of children or animals. The device should have rubber grips on the bottom, but a firm tug could cause it to fall.

The nixie display tubes are made of thick glass. If one of them breaks, please take extreme care when picking it up. I would advise you sweep it up, and avoid ever touching the glass with your hands.

3. Set-up:

This short section should help get your thermometer set up and running effectively. It’ll touch upon ideas for good places to set up your thermometer, as well as advising against bad places. People who are familiar with thermometers can probably skip this section.

There are two different ways to run your thermometer, depending on your preference. They are as follows:

Mains supply: Some of you might choose to run your thermometer from the mains. This gives you a much wider range of choices when setting up your thermometer. To connect the device to the wall, just plug your USB cable into the mains adapter supplied in the box.

When choosing somewhere to put your thermometer, you should be conscious of the temperature and air flows of the area you choose. For example, you should avoid placing your thermometer on the fireplace (or above an electric heater), because the hot air will rise up and interfere with the thermometer’s reading.

USB: The easiest way. Just plug the device into your computer/laptop USB socket. Please note that the thermometer may not function correctly if connected to an unpowered USB hub, it requires about 350mA.

If you’ve got your thermometer connected to the USB port of a computer/laptop, then set-up is easy enough. You can just rest it somewhere on your desk.

Using an external sensor: This section is still under construction. For more information, please send an email to ‘tony at’. You’ll need a DHT11 sensor (easily found on ebay), a 3.5mm stereo jack plug and some 3-core cable, length depending on where you want to set it up.

4. Using your thermometer:

So you’ve got your thermometer built, and now you want to know how to use it. In this section, I’ll explain how to control your thermometer, as well as what modes it has.

Control: The thermometer is motion-controlled. To change between different modes, simply wave your hand over the thermometer (if it doesn’t respond to the movement, try moving your hand a little slower. If it still doesn’t work, try cupping your hand down slightly as you pass over).

Modes: The thermometer has four modes to choose from. When you put the thermometer off, it should remember the last mode you were on for next time.

The modes are as follows:

Mode 1 (Celsius): The default mode. Your thermometer should start in this mode the very first time you switch it on. It’ll display the temperature degrees in Celsius (a popular temperature scale used in many places around the world), and the humidity of the room.

Mode 2 (Fahrenheit): In this mode, the thermometer will display the temperature in Fahrenheit (the official temperature scale used in the United States), as well as the room humidity.

Mode 3 (Kelvin): This mode is for you nerds out there. The thermometer will display the temperature in Kelvin, a measurement system popularly used in science laboratories, followed by the humidity of the room.

Off (With LEDS): The nixies will switch off, but the LEDS will stay on. This mode exists only to separate the ‘normal’ modes from Mode 4 (see below).

Mode 4 (Scramble mode): So called because of the way the numbers jumble their way onto the displays in a random pattern. In ‘scramble mode’, the thermometer repeats the three modes shown above, but with a twist: it’ll normally display the temperature in the scale of your choice, but occasionally it’ll throw up a temperature in another scale. This mode is intended to make the thermometer more dynamic.

Off (Without LEDS): The nixies and LEDS go off. If you change mode while in this mode, it’ll reset back to Mode 1.

5. FAQ (Work In Progress):

Q: Where are the assembly instructions?

A: They’re here. The Lasermad forum is a great place to ask about any problems you’re having. Similarly, try and help out anyone who seems to be struggling with something that you can help with.

Q: Help! My thermometer doesn’t work!

A: If you’re thermometer isn’t working, please first make sure you followed the assembly instructions carefully. If you’re confident that the thermometer is broken, then contact us at ‘tony at’ and we’ll work out a solution.

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