Source: https://guthlabs.ai/docs/instruments/oven-temperature-converter/implementation/

instrument implementation / implementation-contract

# Oven Temperature Converter implementation

A source-bound implementation contract for Oven Temperature Converter; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## 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**: t2-031

**Effect**: Computation or source lookup only

## Input and validation requirements

The spec has a material convention ambiguity: applying the stated −20 °C rule versus the stated −25 °F rule produces different convection temperatures. At extreme finite inputs, JavaScript precision also erases the 25 °F adjustment.

## 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": {
    "temperature": 350,
    "unit": "°F",
    "oven_type": "conventional"
  },
  "expected_outputs": {
    "converted_celsius": 176.67,
    "suggested_convection_fahrenheit": 325,
    "suggested_convection_celsius": 162.78,
    "suggested_time_reduction_percent": 25
  },
  "working": "1. Convert temperature: (350−32)×5/9 = 318×5/9 = 1590/9 = 176.6667°C, which rounds to 176.67°C. 2. Apply the Fahrenheit convection rule: 350−25 = 325°F. 3. Convert the suggested convection setting: (325−32)×5/9 = 293×5/9 = 1465/9 = 162.7778°C, which rounds to 162.78°C. 4. The heuristic time suggestion is a 25% reduction."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/oven-temperature-converter/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/oven-temperature-converter/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/oven-temperature-converter/qualification/>)

## Sources and evidence

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

- `VERIFIED_LEDGER.json`

- `evidence-tranche2/tranche2-results.json`