Independent comparisons. We may earn from shop links. More info

Measuring and marking tools blog | lines and levels

Blog10 articles

Measuring and marking tools guides for UK DIY: builders' line sag, fence posts, drain fall, vial checks, chalk lines, prices and rights when a level fails.

Drain fall 1 in 40: why a centred bubble is wrong
Rules7 min read

Drain fall 1 in 40: why a centred bubble is wrong

A drain fall 1 in 40 spirit level check is made by a calculated drop, not by simply centring the bubble. A normal centred vial means zero fall. 1:40 m

October 2026Read article
Builders line vs chalk line: choose the right one
Comparison6 min read

Builders line vs chalk line: choose the right one

You have marked both ends of a wall, stretched a line between them and now need to decide whether to leave it in place or lift and snap it. That choic

October 2026Read article
How often to check a spirit level: practical triggers
Maintenance7 min read

How often to check a spirit level: practical triggers

How often to check a spirit level depends on what has happened to it, not on a fixed monthly date. Check every line level when the pack arrives, after

October 2026Read article
Builders line sag: how to keep your line true
Diagnosis7 min read

Builders line sag: how to keep your line true

You pull the cord tight between two pins, step back and it looks straight. Then the middle of the brick course rises towards it, or a line level gives

October 2026Read article
Builders line care for nylon cord and its vials
Maintenance7 min read

Builders line care for nylon cord and its vials

A builders line can look serviceable on the reel yet behave badly as soon as you pull it across a course of brick. The cord grows furry, the reel rele

October 2026Read article
String line fence posts UK: keep every post straight
DIY vs pro7 min read

String line fence posts UK: keep every post straight

The awkward moment comes after several holes have been dug: each post is only slightly out, but the complete fence bows across the garden. For string

October 2026Read article
String line level price UK: what to budget for
Cost7 min read

String line level price UK: what to budget for

You can spend about £5 on a string line level, clip it to a taut builders' line and set out a fence or patio edge the same afternoon. You can also spe

October 2026Read article
When not to use a line level: choose the right tool
Special7 min read

When not to use a line level: choose the right tool

You have pulled the string tight, clipped on the little vial and centred the bubble. That proves only that the short part of the line beneath the vial

October 2026Read article
Line levels not reading the same: test the pack
Diagnosis7 min read

Line levels not reading the same: test the pack

You clip two new line levels onto the same taut string, and one bubble sits between its marks while the other leans towards an end line. That is not a

October 2026Read article
Consumer Rights Act faulty goods: your 30-day rights
Rules7 min read

Consumer Rights Act faulty goods: your 30-day rights

You set a new level on a shelf, turn it end for end and watch the bubble move to a different position. If the tool cannot agree with itself, you need

October 2026Read article