Cell Counting / Hemocytometer Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t5-163

Effect

Computation or source lookup only

Input and validation requirements

The instrument has an undefined-result failure when number_of_squares is zero and a potentially 100-fold numerical discrepancy when the dilution notation 1:10 is interpreted using the wrong convention.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "counts_per_square": [
      84,
      91,
      88,
      87
    ],
    "number_of_squares": 4,
    "dilution_factor": 2,
    "total_volume_mL": 5
  },
  "expected_outputs": {
    "cells_per_mL": 1750000,
    "total_cells": 8750000
  },
  "working": "Average count = (84 + 91 + 88 + 87) ÷ 4 = 350 ÷ 4 = 87.5. Cells/mL = 87.5 × 2 × 10,000 = 1,750,000 cells/mL. Total cells = 1,750,000 × 5 mL = 8,750,000 cells."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche5/tranche5-results.json