Measure with a ruler activity

Open Measure with a ruler activity on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.

Tool capabilities

{
  "id": "measure-with-a-ruler-activity",
  "category": "education-tools",
  "built": true,
  "requirements": "Up to 16 measurement lines on A4 or US Letter. Lengths are bounded by the selected unit and page layout. Print at 100% actual size with page scaling off, then measure both calibration bars. Printer scaling and physical output are not verified by the tool.",
  "implementation": {
    "fields": [
      {
        "key": "unit",
        "label": "Measurement scale",
        "value": "cm",
        "type": "select",
        "values": [
          "mm",
          "cm",
          "cm-half",
          "in-half",
          "in-quarter",
          "in-eighth"
        ],
        "labels": {
          "mm": "Millimetres (1 mm steps)",
          "cm": "Centimetres (1 cm steps)",
          "cm-half": "Centimetres (0.5 cm steps)",
          "in-half": "Inches (1/2 in steps)",
          "in-quarter": "Inches (1/4 in steps)",
          "in-eighth": "Inches (1/8 in steps)"
        }
      },
      {
        "key": "count",
        "label": "Number of measurement lines",
        "value": 8,
        "type": "number",
        "min": 1,
        "max": 16,
        "step": 1
      },
      {
        "key": "minLength",
        "label": "Shortest length",
        "value": 2,
        "type": "text",
        "maxLength": 20,
        "help": "A whole number, decimal or fraction in the selected unit."
      },
      {
        "key": "maxLength",
        "label": "Longest length",
        "value": 15,
        "type": "text",
        "maxLength": 20,
        "help": "A whole number, decimal or fraction in the selected unit."
      },
      {
        "key": "paper",
        "label": "Paper size",
        "value": "A4",
        "type": "select",
        "values": [
          "A4",
          "Letter"
        ]
      },
      {
        "key": "seed",
        "label": "Seed",
        "value": 1,
        "type": "number",
        "min": 1,
        "max": 4294967295,
        "step": 1
      }
    ],
    "registrationFamily": "learning-activities-reference",
    "input": false,
    "presentation": "metrics",
    "note": "Create true-scale measurement lines with answer key, PDF and SVG, plus 100 mm and 1 in calibration bars. Print at 100% (actual size) with page scaling off, then check both bars. Printer scale cannot be verified here.",
    "example": {
      "input": "",
      "options": {
        "unit": "cm",
        "count": "4",
        "minLength": "2",
        "maxLength": "8",
        "paper": "A4",
        "seed": "1"
      }
    },
    "experience": {
      "automatic": false,
      "single": false,
      "inputMaxLength": 1000000,
      "inputMode": "text",
      "label": "Your text",
      "placeholder": "Type or paste your input…",
      "help": "Up to 1,000,000 characters. Review the settings before running.",
      "helpParts": [
        "Up to 1,000,000 characters.",
        "Review the settings before running."
      ],
      "action": null
    },
    "mode": "explicit",
    "interactive": false
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}

Page guide