How to choose a torpedo level: magnet, vials and length

The torpedo level is the short level for checking level, plumb and angles in tight spaces: on pipes, electrical boxes, profiles and machines. If you work on steel, choose a magnetic model, because it stays in place and leaves your hands free. In the collection the lengths range from 63 to 285 mm and the number of vials from 1 to 3.

Types

• Basic torpedo. The entry-level model, for quick checks, such as the Stanley Torpedo Basic.
• Job-site torpedo. Stanley's Contractor and FatMax series, such as the Torpedo Contractor and the FatMax.
• Magnetic torpedo. With magnets in the base, including rare-earth ones: the FatMax magnetic level clings by itself to steel pipes and profiles.
• Pocket level. Even smaller, like the Stanley pocket level or the models in the Stabila torpedo and pocket levels set: it fits in a pocket and is used for quick checks.

How to choose for the job

A torpedo level doesn't replace a long level: it complements it. On site many people keep one on their belt for work on steel and a long one for masonry.

Features to look at

• Length. From 63 to 285 mm. The smallest sizes are pocket levels; as you go up you find the working torpedo levels.
• Number of vials. 1, 2 or 3. With just one you read a level surface; with three you also check plumb and an angle.
• Vial type. Some models have 45°, 90°, 180° and 360° vials. The 45° and 90° ones are for checking angles and plumb, the 360° one for reading a level surface in several directions.
• Magnetic. Yes, no, or yes with rare-earth magnets. Rare-earth magnets hold better on pipes and profiles.
• Material. Aluminium or plastic.
• CE marking. Present in the collection data.

Common mistakes

• Buying one without a magnet and then using it on steel. You have to hold it with one hand, and you're short a hand for the rest of the job.
• Using it to check long surfaces. A short torpedo level isn't enough for a screed: you need a long level.
• Not cleaning the filings off the base. The magnet attracts filings: if they stay on the base, the level doesn't sit properly and the reading is wrong.
• Not checking the calibration. Turn the level through 180° on the same spot and read it again.
• Dropping it. Impacts can shift the vials.
• Choosing by size alone. A very small level is handy but gives a less stable reading on a large surface: choose the length according to the workpiece.

Frequently asked questions

What is the V-groove on the base for?

It centres the level on pipes and round bars, so you read it correctly.

Torpedo or long level?

The torpedo level for tight spaces and quick checks. The long one for large surfaces, masonry and floors.

Magnetic or not?

Magnetic if you work on pipes, profiles, metalwork and steel machinery. If you work on wood, masonry or plastic you don't need the magnet.

How do you use it on a pipe?

Rest the V base on the clean pipe so that the level centres itself, and read the vial looking straight at it.

How many vials do I need?

One for a simple level surface, three if you also want to check plumb and angle with the same tool.

You'll find all the models in the torpedo levels collection; to choose the right one, ask for a quote or advice from the AMES technicians.