PVC Guitar String Action Ruler & Setup Gauge

Unsure whether your guitar's string height has changed?

When your guitar feels different under your fingers, guessing at the gap between the strings and frets makes it difficult to compare one setup with another. This PVC guitar string action ruler gives you a visible measurement reference. Use it to observe string height and record what you find, rather than relying only on how high the strings appear from a distance.

A physical gauge, not an electronic tuner

The card-style tool has printed height references along one edge and ruler scales around other edges. It does not detect a note, measure pitch or tell you whether a string is sharp or flat. Although the earlier listing called it a tuner and intonation tool, its pictured function is checking physical dimensions, particularly string action.

There are no batteries to charge or replace. For pitch tuning or intonation checks, you still need an appropriate separate method or tuner. This ruler can support a setup inspection, but it does not adjust the instrument or guarantee that buzzing, playability or tuning issues will be resolved.

Compare the gap against clear reference marks

The gallery shows the ruler standing on the frets alongside a string so its height can be compared with the printed markers. The action references are labelled 1.00, 1.50, 1.75, 2.00, 2.25, 2.50, 2.75, 3.00, 3.50, 4.00 and 4.50 mm. Yellow blocks and contrasting lines make those reference positions visible on the face of the card.

Additional pictured features include a metric ruler running from 0 to 80 mm on the reverse and colour-coded markings labelled 34, 35, 36 and 37 mm on the front. These are printed references, not evidence of a certified measurement tolerance. Keep the ruler seated consistently and read the scale square-on when comparing observations.

Printed action chart for reference

The reverse carries a chart headed “String Action at 12th Fret.” The figures below reproduce its first-string and sixth-string column labels. Treat them as the tool's general reference information, not mandatory settings for every instrument or player.

The bass row appears under the same printed column headings; that does not imply every bass has six strings. Follow the instrument maker's guidance or consult a guitar technician before making adjustments.

A small addition to your maintenance routine

Imagine checking your instrument before a rehearsal and writing down the action you prefer. Keeping that observation gives you something concrete to compare at your next inspection. The flat card can stay with your own maintenance equipment, ready when you want to take another reading.

• Material: PVC, as listed in the specifications
• Pictured dimensions: 8.5 × 5.4 cm / 3.34 × 2.12 inches
• Existing option: one size
• Origin: China

Suitable access to the strings and frets is needed; universal fit across all string instruments is not established. The listing is for the ruler, not the guitar or other workshop equipment shown in the photographs.