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8-Second 
Dishwasher Safe Thermometer

Distributed By: 
Microlife USA, Inc. 
1617 Gulf to Bay Blvd., 2nd Floor 
Clearwater, FL 33755 

www.microlifeusa.com

 

Sensor Tip

Flexible Probe

Power Button

Model #MT18L1-PRO

This predictive clinical digital electronic thermometer is for the intermittent 

measurement and monitoring of human adult and pediatric body temperatures; 

orally, rectally and under the arm. 
This thermometer can be used with or without a tip 

cover. To use a cover, slide onto sensor tip until fully 

engaged and peel off paper. Covers are for single 

use, do not reuse. If thermometer has been in a 

cold environment, allow it to warm up to room  

temperature for about 15 minutes before use. Avoid 

storing at temperatures above 140

˚

 (60

˚

 C). 

This thermometer IS intended to be used: 

• For self-measurement/monitoring of human body temperature whereas the  

person being measured may be the user/operator of the device. 

• Orally, Rectally and Under the Arm (axillary). 

• Adults 

• Pediatric 

This thermometer IS NOT intended for use with: 

• Neonatal  

General Warnings 

• Contact your physician in case of prolonged fever as this requires medical attention, 

especially for young children. 

• Self-measuring means monitoring, not diagnosis or treatment. Under no circum-

stances should you independently alter the dosages of any drugs prescribed by 

your physician. 

• Do not use this device if you think it is damaged or anything appears unusual (e.g. 

sporadic operation, open packaging upon purchase). 

• To avoid possible injury, do not run or walk while using this device. 

• Ensure that children are supervised around this medical device; some parts are 

small enough to be swallowed. 

• Keep batteries away from children; harmful if swallowed. 

• Do not dispose of the battery or device in fire; the battery may explode. 

• Do not use a metal tool to replace the battery; doing so may short circuit the terminals. 

• Do not attempt to recharge the battery as they are not rechargeable.  

• Only open the thermometer battery cover to replace the battery (when applicable); 

and replace all batteries at the same time if more than one is required for the 

thermometer. We do not recommend the use of rechargeable batteries for  

replacements. 

• Do not open/modify this device; inaccuracy and/or harmful injury may result. 

• Performance of this thermometer may be degraded if used outside of its specified 

operation temperature and humidity rating, or if stored outside of its specified 

storage temperature and humidity rating. Avoid dust or storage in direct sunlight. 

• Performance of this thermometer may be degraded if the device is exposed to 

mechanical shock. 

• Performance of this thermometer may be degraded if the patient’s temperature is 

lower than that of the ambient. 

• Performance of this thermometer may be degraded if the tip is dirty or damaged; 

ensure the tip is clean before using. 

• Performance of this thermometer may be degraded if the probe cover is dirty or a 

probe cover not intended for use with this device is used. 

• Any probe covers that may be included in this device package are for single use only. 

• This device contains sensitive electronics components. Avoid strong electrical or 

electromagnetic fields in the direct vicinity of the device (e.g., mobile telephones, 

microwave ovens). These can lead to temporary impairment of the measuring 

accuracy. Move the device to another location if interference is determined. 

Maintain a minimum distance of 3.3 m from such devices when using this unit. 

• According to international standards, your device should be checked for  

accuracy every 2 years. 

 

How to Take a Temperature:

 

Press power button to turn unit on. Display should read “188.8” to confirm normal 

function. An “Err” message indicates unit is not working properly. The last 

recorded measurement will show for 2 seconds, followed by a large “L” and a 

flashing “F” or “C”, indicating that thermometer is ready for use. 

 

Oral Use: 

• Do not drink hot or cold liquids or exercise before use. 

• Place sensor tip under tongue as shown in Figure A. 

• Accurate temperature reading will take approximately 

8 seconds with proper use. An open mouth or  

improper placement could make reading take longer. 

Underarm Use:

 

• Wipe underarm with dry towel. 

• Place sensor tip in armpit and lower arm against body 

as shown in Figure B. 

• Accurate temperature reading will take approximately  

15-20 seconds with proper use. 

Reading the Temperature: 

For readings 99.5

˚

 F (37.5

˚

 C) and below, the thermometer beeps 5 times and the 

display shows a green back light for 3 seconds to indicate temperature is 

within normal range.  
For readings above 99.5

˚

 F (37.5

˚

 C), the thermometer emits a series of short, 

rapid beats and the display shows a red back light for 5 seconds to indicate a 

possible high temperature. 

If battery is low, back light will not function until battery is replaced. 

 

 

Changing from °F to °C: 

With the thermometer turned off, press and hold the power button for 5 seconds. 

Release and press again to toggle between °F or °C. When you’ve made your 

selection, wait 3 seconds for °F or °C to start blinking and press the button 

again to confirm your selection. When you turn your thermometer on again the 

next time, it will be set to your selection. 

How to Clean: 

Clean thermometer before and after every use. There are 2 cleaning options below: 
1. Alcohol: Clean sensor tip with 70% isopropyl alcohol. Wipe dry with sterile 

cotton ball.  

2. Dishwasher Safe: To clean in dishwasher, place thermometer on top rack 

only. Run dishwasher on normal cleaning cycle. High heat drying cycle is 

NOT recommended. 

How to Change Battery: 

Replace battery when “ ” appears on display.Insert 

coin into groove on battery lid. Rotate counterclockwise 

to open. Replace old battery with new battery (3V, 

CR1632). Plus (+) sign should face upward.Replace lid 

and rotate coin clockwise to close. 

Limited Warranty: 

This thermometer is warrantied for 5 years by Microlife USA Inc, against  

manufacturer defects for the original purchaser only, from date of purchase. 
The 5 year warranty applies to the thermometer. Batteries and case are not 

covered by this warranty. There are no user serviceable parts inside.  
The warranty does not apply to consequential and incidental damages, or 

damage caused by batteries, improper handling, and accidents. Professional 

use, not following the operating instructions, and alterations made to the  

device or accessory by third parties, are also not included in this warranty. 

Some states do not allow the exclusion or limitation of incidental or consequential 

damages, so the above limitation or exclusion may not apply to you. 
Microlife USA Inc will investigate your concern. A product as defined by this 

warranty, determined to be out of specification, will be replaced and shipped 

to you at no cost. A product or accessory as defined by this warranty, determined to 

be within specification, will be returned to you with a report of findings, at no cost. 
Please call customer service: 1-800-568-4147 regarding any warranty concerns. 

We ask that you please contact us before sending any product back in order to 

better identify, and more quickly process, your concern. 
This warranty gives you specific legal rights, and you may also have other 

rights which vary from state to state. 

Technical Specifications: 

Measurement range: 

90.0°F (32.0°C) to 111.0°F (43.9°C) 

Measurement Accuracy: 

±0.2°F (±0.1°C) between 93.2°F  

(34°C) to 107.6°F (42°C)  

Self test: 

Automatic internal check of sensor circuit. 

If error, «Err» is displayed.  

Display: 

Liquid crystal display (LCD) with four digits 

Auto Off:

After 3 minutes of inactivity 

Smallest unit of display:

0.1°F (0.1°C) 

Signaling tone: 

For signaling that the thermometer is ready 

to use and that the temperature increase is 

less than 0.2°F (0.1°C)/8 seconds. 

Memory: 

For storing the last measured value 

Operating Temperature: 

50 °F(10 °C) to 104 °F (40 °C) 

Storage temperature:

 -13°F (-25°C) to 140°F (60°C) 

Humidity:

15% to 95% (non-condensing) 

Battery: 

3V, CR1632 

Expected Product life:                     5 years 
Service:

When the device is not in use, battery/access 

may be replaced by the user. No other parts/ 

components are accessible. 

Disposal:

Batteries and electronic instruments must be 

disposed of in accordance with the locally  

applicable regulations, not with domestic waste. 

Reference to Standards: 

This medical device is compliant with medical  

Device Standard: 

device and thermometer standards IEC 

60601-1, IEC 60601-1-2, IEC 60601-1-11 ASTM 

E-1112, EN 12470-3, ISO 10993-10:2010, ISO 

10993-5:2009, and ISO10993-12:2012 

Ingress Protection (IP67)

:

Totally protected against dust ingress,  

protected against the effect of immersion in 

water between 15cm and 1m. 

Electromagnetic Compatibility:  Device fulfills the stipulations of the standard 

IEC 60601-1-2 

Accuracy:

Clinical accuracy characteristics and proce-

dures are available from the manufacturer 

on request. 

 

 
 

battery

MT18L1-PRO-0420-4   

Made in China

Test Protocol (for laboratory use only): 

1. Place thermometer into waterbath. The tip of the thermometer should be 

approximately 2cm below the surface. 

2. Wait for 10 seconds, then turn the thermometer on by pressing the “On/Off” 

button. The thermometer is now in test mode. 

3. When the measurement is completed, record the temperature reading; 

there will be no audible or visible signal while in test mode.

Questions? 

We’re here to help. Call toll-free 

1-800-568-4147

(Figure B)

(Figure A)

Read the instruction manual carefully before using this device, especially the 
safety instructions, and keep the instruction manual for future use.

Type BF applied part

LCD Display

Function Check

Last Recorded 

Temperature

Ready to 

Measure

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