JD-861 is a battery-powered instrument for measuring relative humidity and temperature. It can display three different ambient temperature, wetbulb temperature and dew point temperature of the air around its sensor.

Features:
Digital temperature and humidity sensor, high accuracy with quick measurement speed.
LCD display, you can see the humidity, temperature, min and max value clearly.
Short press the M button to switch between maximum and minimum.
Long press the M button for 2 seconds to turn on automatic shutdown, and automatically shut down after 30 minutes. The factory default is off.
Short press the button to switch temperature unit, switch sequence: Dewpoint- Wet Bulb-Dewpoint- WetBulb.
Long press the button for 2 seconds to turn on the backlight. The factory default is to turn off the backlight.
Data-hold funtion: short press the H button to freeze the current reading.

Specifications:
Name: Temperature and Humidity Meter
Model: JD-861
Material: ABS
Battery: 1 * 6F22 battery (not included)
Measuring-range: -30 to 100(-22 to 212)
Accuracy: 0.5 (25, 20%RH-80%RH); 0.9 (77, 20%RH-80%RH); 0.8/1.5
Relative humidity-range: 0-100% RH
Accuracy: 2%RH (25/77, 20%RH-80%RH); 2.5%RH (Other range)
Resolution: 0.1%RH
Working environment Temperature 5C-40C (41-104) Relative humidity: < 85> Non-condensing air-pressure: 100 kPa-80 kPa
Item size: 155 * 102 * 45mm / 6.10 * 4.02 * 1.77in
Item weight: 140g / 4.94ounce
Package size: 160 * 110 * 50mm / 6.30 * 4.33 * 1.97in
Package weight: 150g / 5.29ounce

Packing List:
1 * Temperature and Humidity Meter