Introduction
Thank you for selecting the Extech Model CTH10A Radio Controlled Clock with Hygro‐
Thermometer displays. The CTH10A is a real‐time calendar Clock (12/24 hour) that also displays
temperature and relative humidity measurements taken from its internal environmental sensors.
The clock can be set manually or automatically using the RC‐WWVB time signal. The CTH10A
includes an audible/visible daily alarm function with 'snooze' mode.
This device is shipped fully tested and calibrated and, with proper use, will provide years of
reliable service. Please visit our website (www.extech.com) to check for the latest version of this
User Guide, Product Updates, Product Registration, and Customer Support.
Meter Description
A1: RC‐WWVB time signal Icon
A2: Time Display
A3: Date
A4: Day of Week
A5: Indoor Humidity
A6: Indoor Temperature
B1: 'Snooze' Button
B2: 'MODE/SET' Button
B3: '+ 12/24' Button
B4: '‐ C/F
' Button
B5: 'RESET' Button
B6: 'AL ON/OFF' Button
C1: Wall Mount Hole
C2: Battery compartment
C3: Tilt Stand
2
EXTECH INSTRUMENTS
CTH10A‐en‐GB_V2.3 10/15
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