Yonker specializes in portable medical testing devices, including infrared thermometers, pulse oximeters, fetal dopplers, and phototherapy instruments.
Yonker is a manufacturer of portable medical devices and health monitoring equipment designed for both clinical and home use.
Their product lineup includes non-contact infrared forehead thermometers for hygienic temperature readings, fingertip pulse oximeters for measuring blood oxygen saturation, fetal dopplers for monitoring fetal heart rates, and specialized portable UVB phototherapy instruments for treating skin conditions like vitiligo and psoriasis. Yonker focuses on delivering accurate, easy-to-use health tools with features like smart analysis, acousto-optic prompts, and compact designs to empower patients and medical professionals alike.
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Aim the sensor at the middle of the forehead above the eyebrows, keep it under 5 cm away without touching the skin, and press the start/trigger button. Ensure the forehead is free of hair, sweat, and cosmetics before measuring.
'Lo' means the measured temperature is below 34.0°C (93.2°F), while 'Hi' signifies the temperature is above 43.0°C (109.4°F). Try taking the measurement again in a stable room temperature, adhering to proper guidelines.
Depending on the model, you can normally press and hold the 'MODE' or start button from a shutdown state until the unit screen changes, or enter the 'F1' setup menu to switch between °C and °F using the up/down keys.
Ensure your finger is inserted completely into the rubber hole with the nail facing upward. Also check that you are not trembling your finger, your nails are not painted with polish, and the batteries have sufficient power.