Quick answer: The testo 270 measures frying-oil total polar material (TPM), reported in percent, so operators can track oil degradation. It is not a direct chemical assay for every hazard or food-safety limit.
What makes the testo 270 different
The testo 270 measures total polar materials (TPM) in frying oil and displays a percentage; it does not identify a particular contaminant or prove food safety alone. The product page states a measurement temperature range of 40–200°C. For a separate core-temperature check, see the testo 108-2 food thermometer guide.
Prepare and carry out the measurement
- Use the approved hot-oil safety procedure and check that the oil temperature is within the instrument’s specified measurement range.
- Remove food residues and wait for the cooking process to settle before immersing to the marked depth.
- Wait for a stable TPM reading, sample comparable locations/conditions and document oil type and fryer number.
- Interpret the trend using the site’s legal and quality criteria, not a generic universal coloured alarm setting.
Model-specific use and interpretation
Remove food and visible residues, follow the safety procedure for hot oil, immerse between marked depths and wait for a stable result. Compare repeat readings under similar temperature and oil conditions.
A higher TPM value usually indicates accumulated degradation products. Results depend on oil and sampling conditions, and configured green/amber/red thresholds should reflect the applicable procedure.
The unit’s configurable colour-coded alarm is only meaningful if its thresholds are set to the applicable kitchen or regulatory procedure; no single TPM limit fits every jurisdiction.
Worked example (hypothetical)
Hypothetical trend on one fryer: 11.0% TPM on Monday, 15.5% midweek and 19.0% at the next check. The 8.0-percentage-point increase establishes a trend, not a universal discard decision.
TPM is an oil-degradation indicator, not a universal law
The testo 270 reports TPM (%) with a stable reading when immersion depth and oil temperature suit the instrument. Its built-in traffic-light thresholds are configurable and must match the operating procedure. Check oil type, fryer condition and local requirements before deciding when to replace the oil. Testo’s instructions specifically note avoiding visible food residues or bubbling that can disturb a reading.
Interpretation: A change from 12.0% to 18.0% TPM is a six-percentage-point rise; it is not proof that a legal limit has been breached.
Limits and safety
Follow the exact instrument manual and the equipment manufacturer’s acceptance criteria. The example is not field evidence, a legal limit or a commissioning target. Work on energized electrical equipment, combustion systems, charged refrigerant circuits or hot surfaces requires qualified personnel and the site’s approved protective procedures.