# K031958: Microlife Instant Digital Electronic Thermometer, Model QT1JA1

- Pathway: 510(k) (Traditional)
- Applicant: Microlife Intellectual Property GmbH
- Decided: Aug 15, 2003 after 51 days
- Product code: FLL (Continuous Measurement Thermometer)
- Device class: 2
- Regulation: 21 CFR 880.2910
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
Longest line of descent: 3 generations back to K943695 (1995). 3 ancestors in all.
8 later devices descend from it; 3 cite it directly.
0 of 12 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- K012136: Avita Agil IT 101 Instant Digital Thermometer, Avita Corporation (2001) Summary page 1.

## Most influential descendants
- K043110: Microlife Instant Digital Electronic Thermometer, Model MT18L1 (2004), 5 descendants of its own
- K152975: VDT985US Vicks SmartTemp Thermometer (2016), 3 descendants of its own
- K180131: Vicks RapidRead Digital Thermometer (2018), 2 descendants of its own
- K202791: iHealth Clinical Digital Thermometer (2021), 1 descendant of its own
- K211352: Electronic Thermometer (XHF2001, XHF2002) (2021), 0 descendants of its own

## Indications for use
The Microlife Instant Digital Thermometer, Model, QT1JA1 is used for the intermittent measurement and monitoring of human body temperature, orally, rectally and under the arm. The Microlife Instant Digital Thermometer, Model, QT1JA1 is a hand-held, non-sterile, reusable clinical thermometer intended for the determination of human temperature in either predictive (Instant) mode (5- seconds orally, 7- seconds rectally and under the arm-predictive temperature), or standard mode (actual determination of temperature). The device is for the adult and pediatric population.

Source page: https://510kreport.com/device/K031958
Methodology: https://510kreport.com/methodology