Levenhuk Wezzer PLUS LP90
CO2 Monitor
User Manual



- CO2 scale
- Current CO2 reading (ppm)
- Temperature
- SET button
- Humidity
- UP button
- DOWN button
- ALERT button
- MAX./MIN. button
- Backlight button
- 3.5mm DC jack
Levenhuk Wezzer PLUS LP90 CO2 Monitor
The kit includes: CO2 monitor, USB cable, user manual, and warranty.
Caution! Please remember that mains voltage in most European countries is 220–240V. If you want to use your device in a country with a different mains voltage standard, remember that use of a converter is absolutely necessary.
Getting started
Connect the power cable to the device and the DC adapter (not included) via a USB plug and connect it to the AC power supply. Relevant CO2 data will be displayed within 2.5 minutes.
Button panel and device settings
CO2 readings
ATTENTION! When the CO2 level exceeds 2400 ppm, the
icon starts flashing.
400—600ppm green zone | normal outdoor air CO2 level |
601—1400ppm cyan zone | typical level for occupied spaces with good air exchange |
1401—1900ppm yellow zone | ventilation is recommended |
1901—2400ppm red zone | ventilation strongly recommended |
2401—5000ppm | is associated with such symptoms as headache, sleepiness, poor attention, increased heart rate, and nausea |
> 5000ppm | serious oxygen deprivation that may lead to brain damage, coma, and death |
CO2 and humidity settings
Press and hold the SET button to enter the settings. The digits that are to be set are flashing. Press UP or DOWN to change the value.
The setting order: low CO2 alert level > high CO2 alert level > low RH% alert level > high RH% alert level. When the CO2 or humidity value reaches the set high or low alert level, the
or
icon appears and starts flashing.
Acoustic alert Press the ALERT button to turn the CO2 alarm on. Press the button again to disable the sound alarm.
History
Press the MAX./MIN. button to display the MAX. and MIN. records.
Display order: MAX. CO2 level > MIN. CO2 level > mean CO2 value within 15 minutes> mean CO2 value within 8 hours. Press and hold the MAX./MIN. button to clear the history records.
Temperature
Press the UP button to switch between °C and °F.
Specifications
Operating CO2 range | 400—5000ppm |
Air humidity, units of measurement | % (RH) |
Operating humidity range | 20… 95% |
Temperature, units of measurement | °F, °C |
Operating temperature range | 0… +50°C (+32… +122°F) |
Screen | color, with an LED backlight |
Power supply | AC/DC adapter 5V 500mA (not included) |
USB cable | 1.5m (4.9ft.), included |
Dimensions | 117x76x117mm (4.6x3x4.6in.) |
The manufacturer reserves the right to make changes to the product range and specifications without prior notice.
Care and maintenance
- Take the necessary precautions when using the device with children or others who have not read or who do not fully understand these instructions.
- Make sure that the air flow channels at the back of the device are not blocked or covered.
- Do not try to disassemble the device on your own for any reason. For repairs and cleaning of any kind, please contact your local specialized service center.
- Protect the device from sudden impact and excessive mechanical force.
- Store the device in a dry, cool place away from hazardous acids and other chemicals, away from heaters, open fire, and other sources of high temperatures.
- Operate the device only in a completely dry environment and do not touch the device with wet or damp body parts.
- Only use accessories and spare parts for this device that comply with the technical specifications.
- Check this device and its cables and connections for any possible damage before use.
- Never attempt to operate a damaged device or a device with damaged electrical parts! Damaged parts must be replaced immediately by an authorized service agent.
- If a part of the device or battery is swallowed, seek medical attention immediately.
- Children should only use the device under adult supervision.
Warranty: lifetime. For further details, please visit our web site: www.levenhuk.com/warranty
The original Levenhuk cleaning accessories

Levenhuk Cleaning Pen LP10

Removes dust with a brush
The soft tip is treated with a special cleaning fluid that removes greasy stains
Does not damage optical coatings of the lenses
Leaves no smudges or stains
levenhuk.com
Levenhuk Inc. (USA): 928 E 124th Ave. Ste D, Tampa, FL 33612,
USA, +1 813 468-3001, [email protected]
Levenhuk Optics s.r.o. (Europe): V Chotejně 700/7, 102 00 Prague 102,
Czech Republic, +420 737-004-919, [email protected]
Levenhuk® is a registered trademark of Levenhuk, Inc.
© 2006—2022 Levenhuk, Inc. All rights reserved.
202111116
References
Levenhuk optical instruments store | Levenhuk - best optical equipment
Доживотна гаранция на Levenhuk – Официален уебсайт на Levenhuk в България
Levenhuk lifetime warranty details | Levenhuk - best optical equipment
Doživotní záruka společnosti Levenhuk – Oficiální webové stránky Levenhuk pro Českou republiku
Levenhuk Lebenslange Garantie – Die offizielle Website von Levenhuk in Deutschland
| Levenhuk, los mejores equipos ópticos
Levenhuk Lifetime Warranty – Levenhuk’s official website in Europe
A Levenhuk élettartamra szóló szavatossága – A Levenhuk hivatalos magyarországi weboldala
Gwarancja bezterminowa Levenhuk – Oficjalna witryna internetowa Levenhuk w Polsce
Поддержка - Гарантийное обслуживание Левенгук - Levenhuk Russia

















