Sharpfine Pi Tape / Diameter Tape (also known as π tape) is engineered with a high-precision vernier scale to measure true diameters down to 0.02mm resolution simply by wrapping around the outer or inner circumference of large pipes, cylinders, and round parts.
Out-of-Round Accuracy: Instantly determines the true diameter of round workpieces or the average diameter of out-of-round forms.
0.02mm Vernier Precision: Features a finely laser-etched vernier scale for effortless, direct visual readings without manual π calculations.
Accredited Calibration: Optional third-party laboratory calibration and official certification available upon request.
Looking for a bit more versatility? We’d be delighted to help!
If you need to measure both the circumference and the diameter at the same time, take a look at our Circumference Diameter Ruler.
Pi tapes or Diameter Vernier tapes，due to their exceptional design, the diameter can be got by the circumference, the error of measure result is 1/π less compared to traditional Vernier calipers, ensuring more accurate results.
Resolution:0.02mm /.001” ，（0.01mm / .0005” available upon request）
Measuring range from Ø50mm / 2” to Ø9600mm /384” （larger size tape available upon request.
Made of stainless steel 301 or spring steel 65Mn.
This inner diameter Pi tape is specifically designed for fast and accurate measurement of inner rings and other circular internal cavities.
For an inner diameter Pi tape used to measure metal materials, magnetic attachments can be added to ensure the tape adheres closely to the inner surface of the workpiece, preventing measurement errors.
For Pi tape / diameter vernier tape，specialty sizes available upon client request.
Calibration certificate of π tape / diameter tape available upon client request.
| Range | Range | Range |
|---|---|---|
| 50 - 300mm / 2-12" | 3300 - 3600mm / 132-144" | 6600 - 6900mm / 264-276" |
| 300 - 600mm / 12-24" | 3600 - 3900mm / 144-156" | 6900 - 7200mm / 276-288" |
| 600 - 900mm / 24-36" | 3900 - 4200mm / 156-168" | 7200 - 7500mm / 288-300" |
| 900 - 1200mm / 36-48" | 4200 - 4500mm / 168-180" | 7500 - 7800mm / 300-312" |
| 1200 - 1500mm / 48-60" | 4500 - 4800mm / 180-192" | 7800 - 8100mm / 312-324" |
| 1500 - 1800mm / 60-72" | 4800 - 5100mm / 192-204" | 8100 - 8400mm / 324-336" |
| 1800 - 2100mm / 72-84" | 5100 - 5400mm / 204-216" | 8400 - 8700mm / 336-348" |
| 2100 - 2400mm / 84-96" | 5400 - 5700mm / 216-228" | 8700 - 9000mm / 348-360" |
| 2400 - 2700mm / 96-108" | 5700 - 6000mm / 228-240" | 9000 - 9300mm / 360-372" |
| 2700 - 3000mm / 108-120" | 6000 - 6300mm / 240-252" | 9300 - 9600mm / 372-384" |
| 3000 - 3300mm / 120-132" | 6300 - 6600mm / 252-264" |
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