Open source · Self-hosted · AGPL-3.0

From calibrated instruments
to trusted results.

Open Gauge is a self-hosted registry for sensors, calibration coefficients, and certificates — with full version history, audit traceability, and ISO/IEC 17025-grade reproducibility.

Deploy self-hosted Documentation GitHub repository

$ git clone https://github.com/open-gauge/open-gauge.git
$ cd open-gauge/infrastructure/docker && docker compose up -d

opengauge.local / app / assets / OG-90421

Dashboard

Asset Registry

Locations

Procedures

Activity

v1.0.0 · self-hosted

Reactor Inlet PT-01

Active

OG-90421

Reactor Bay · Main Plant · Endress+Hauser · Cerabar PMP55

Export Sticker Edit

Health score

96/100

Last · Due

14 Feb 2026

14 Feb 2027

204days

Calibrations

3all-time

Overview Health Calibration Files Activity

General

Asset IDOG-90421

ManufacturerEndress+Hauser

ModelCerabar PMP55

OwnerProcess Eng. Team

Specifications

Physical quantityPressure

Range0 – 16 bar abs

Accuracy±0.05% FS

Output signal4–20 mA / HART

Built on open standards, not lock-in

ISO/IEC 17025:2017 JCGM 100:2008 (GUM) OpenAPI 3.1 PostgreSQL Docker Compose REST + JSON

Platform

Built for traceability, designed for engineers.

A modern stack for managing instruments at lab, plant, and fleet scale.

Version-controlled coefficients

Every offset, gain, and polynomial term is committed with diffs, authors, and rollback — just like Git.

ISO 17025 traceability

Immutable audit log, calibration history, and signed certificates built for accredited labs.

API-first, webhook-native

REST + OpenAPI 3.1. Every workflow in the UI is scriptable from CI, ERP, or edge gateways.

QR-tagged in the field

Print asset labels and scan them on a phone or tablet to jump straight to the record.

Sensor health & drift scoring

Calibration age, drift, and uptime fused into a single instrument health score.

Self-hosted by default

Docker Compose today, Kubernetes when you need it. Your metrology data never leaves your network.

Architecture

A clean, layered system you can audit.

No black boxes. No vendor lock-in. Open formats, open protocols, open source.

Stateless FastAPI workers — scale horizontally behind any load balancer
PostgreSQL as the single source of truth for every record
MinIO / S3-compatible storage for certificates and raw calibration files
Pluggable auth — local users, OIDC, or enterprise SSO via Keycloak

Web UI · QR Labels

REST API · Webhooks · OpenAPI 3.1

Calibration Engine · Versioning · Audit Log

PostgreSQL · MinIO (S3-compatible)

AGPL-3.0 · open source docker compose up -d runs on a Raspberry Pi

Product

Every instrument. Every change. Every certificate.

Asset registry

Searchable, taggable, exportable. Built for thousands of sensors, instruments, and reference standards.

OG-90421PT-01Valid

OG-90422TT-12Due soon

OG-90424FT-08Expired

Calibration history

Diff coefficients between revisions just like a code review.

− offset = 0.008

+ offset = 0.012

gain = 1.00041

Signed certificates

PDF + JSON, cryptographically signed and tamper-evident.

CERT-2026-00821

SHA-256 verified

API

REST-first. JSON everywhere.

Scriptable from CI, edge gateways, lab notebooks, or your ERP. OpenAPI 3.1 schema published with every release.

API reference

GET /api/v1/assets/OG-90421

{
  "id": "OG-90421",
  "name": "Reactor Inlet PT-01",
  "type": "pressure",
  "status": "valid",
  "calibration": {
    "valid_until": "2027-02-14",
    "coefficients": {
      "offset": 0.012,
      "gain": 1.00041,
      "quadratic": 2.1e-6,
      "unit": "bar"
    }
  },
  "certificate_url": "/api/v1/certificates/CERT-2026-00821.pdf",
  "_links": {
    "history": "/api/v1/assets/OG-90421/calibrations"
  }
}

Version control for metrology.

Bring traceability, reproducibility, and modern engineering workflows to your instrumentation stack.

Deploy self-hosted Star on GitHub Read the docs

From calibrated instruments to trusted results.