LOT OF 2 PIECES Of THE MOST ACCURATE BUBBLE SPIRIT LEVELS - Made In Europe!

Description

YOU ARE BUYING 2 LEVELS.
BY FAR, THE BEST AND MOST ACCURATE BUBBLE SPIRIT LEVEL AVAILABLE FOR SALE.
MADE IN EUROPE (UK) BY ENGLISH-SPEAKING PROFESSIONAL ENGINEERS.
You will be sent 2 levels when ordering. I am sorry, but screws are NOT include in the sale. I can attach very strong magnets for you, or send magnets for you to attach, both at an additional charge.
To see that I am a seller who only gets 5-star reviews....take a look here:
https://www.ebay.com/itm/172519463009
WHEN BUYING FROM CHINA.....BEFORE THEY SELL YOU LEVELS, THEY CLAIM THEIR LEVELS ARE "ACCURATE" and "PRECISE." In almost every case .....out of the many vendors I tried and the thousands of levels I bought....at least half the levels were just not level. The bubble moved like crazy when you spin/turn the level 180 degrees (this test reveals if the level is accurate or not... the bubble should remain in same place after turning level).
Theeeeeeeeen, when I complained that the "levels" were not even....well, level...then I was told I was "too picky" or that the levels were not for "professional use"....that they were "just toys."
Before I bought, the Chinese sellers' English seemed decent. After my purchase, when there was an issue, all of a sudden these sellers could not "understand" my emails and it was a pain in the neck. "Toys" is a far cry from "accurate and precision." Amazing isn't it?
I am guessing more than 90% of the people buying levels never test them and never realize that some, or all, are not accurate.
On average, if half of the levels I got from China were accurate....that was a good batch. Because I have done this for years, I was able to make these levels accurate, but it took lots of time and frustration.
The chinese low prices seem great, but you really do get what you pay for.
This levels I am selling are VERY ACCURATE and can be SCREWED DOWN, GLUED DOWN, or USED WITH MAGNETS GLUED TO THE BOTTOM. If you use screws with springs, the level can be adjusted to your liking.
If you attach this level to a long straight piece of wood or pipe or anything that is straight ...you can have an instant custom level.
Below is some info re these levels and also level sensitivity and accuracy if you are interested. In summary.....
These levels:
Length 56 mm
Width 15 mm
Height 15 mm
Sensitivity Per 2mm 30 minutes
Bubble Size 11 mm
Line Spacing 12.5 mm
Line Colour Black -
Liquid Colour Yellow/Green -
Backing Colour White -
42.5 - from hole to hole
4.2mm - hole diameter
The level i am selling has a sensitivity of 30, which will give you accuracy within 1/10 to 1/2 of a degree. THESE ARE HIGHLY ACCURATE LEVELS!
Further, the space between the lines is 12.5 mm. The bubble is 11mm. This makes lining up the bubble in the center (the bubble in the middle of the two lines) easy for the user and is a sign of a quality level.
Other Information as stated by the manufacturer:
Spirit Level Sensitivity & Accuracy
The sensitivity is an important specification for a spirit level, as it plays a big part in determining the overall accuracy of the device. There are several different methods of expressing sensitivity and these are all explained below, along with a method for converting between them.
Definition
The sensitivity of a level is defined as the change of angle or gradient required to move the bubble by a set distance (usually 2mm). If the vial has graduated divisions then the sensitivity refers to the angle or gradient change required to move the bubble by one of these divisions (often spaced at 2mm).
Units
The sensitivity can be defined as an angle or a gradient.
As an angle, the standard units are degrees(°), minutes(‘) and seconds(“). 1 degree = 60 minutes and 1minute = 60seconds. (1° = 60′ and 1′ = 60″).
Principles
For all spirit levels the sensitivity specification is determined by the sensitivity of the vials that are used. The sensitivity is determined by the radius of curvature of the vials which the bubble moves across. Even though it cannot always be seen, all spirit level vials are curved. The principle of operation is that the bubble will move to the highest point of the radius as gravity acts on the liquid inside the vial.
See the picture near the bottom for a visual explanation.
Example
If we assume that the bubble in the picture included with the photos has moved 2mm off centre then we would say that this vial has a sensitivity of 5 degrees per 2mm bubble movement. This can also be expressed as a gradient where 5 degrees corresponds to a gradient of 87mm/m (millimetres per metre). That is to say that if this vial was placed on a 1 metre long beam, and one end was lifted by 87mm, this would create an angle of 5 degrees and would thus move the bubble by 2mm.
Relationship Between Radius and Sensitivity
The sensitivity is directly related to the radius of curvature of the vial; the longer the radius, the more sensitive the vial will be; the shorter the radius, the coarser the vial will be
Deciding Which Sensitivity
In order to determine which sensitivity is best for a particular application, it is first necessary to decide how level the product needs to be. Another way of looking at this is to consider what is the maximum angle off-level that the product will still work correctly.
Let's say for this example that the product needs to be level within 0.1° (or 6’). The next assumption we need to make is how accurately the user can centre the bubble between the divisions on the vial. We would normally assume that this is possible to within 0.5mm although in some applications it may be more or less than this. Based on these figures, we need a vial that will give at least 0.5mm bubble movement for a 0.1° (6’) change in angle. This corresponds to 0.4° (24’) for a 2mm bubble movement, so we would say that we need a vial with a sensitivity of at least 24 minutes per 2mm bubble movement, or higher.
The level i am selling has a sensitivity of 30, which results in accuracy to +/- .1 to .5 degree….THIS IS A HIGHLY ACCURATE LEVEL! The space between the lines is 12.5 mm. The bubble is 11mm. This makes lining up the center easy for the user and is a sign of a quality
Please see the attached pictures.
Circle TUBE CYLINDER ROUND screw down, Rv, trailer, pool table, balance, machine