Product review (4 stars): Better than average and fairly accurate instrument.
I received the Ambient WS-26 Jumbo indoor temperature and humidity monitor a couple of weeks ago and after letting it  acclimate to the climate of my home's interior, I recalibrated it following the simple instructions that were included. The recalibration was done using a professional weather monitor that I have in my home office located in my basement. i.e. picture 1. I left the WS-26 in the office for six days and the temperature and humidity stayed within 2% of the readings on the professional weather station monitor. I then brought the WS-26 upstairs and recalibrated it to my professional weather station monitor that I have in my living room. i.e. picture 2.  The WS-26 continues to maintain a 2% variance.
The WS-26 is a nice compact instrument and can be either mounted on the wall or set on a desk or table top using the built in kickstand. The segminented digital numbers are easy to see from 10 feet. There is no backlighting so viewing in the dark can't be done. The adjustment buttons, I think, should have been on the back of the instrument. They are not used enough to  warrant putting them on the front. I feel it would give the device a cleaner look if they were on the back.
For someone whom needs to monitor the inside temperature and humidity, this is a fairly accurate instrument and includes the time, date, and day at the bottom of the display. There is also an alarm function. This device uses 4 AAA batteries that are not included with the product.
 disclaimer: I received the Ambient Weather WS-26 Jumbo Indoor Temperature and Humidity Monitor with Calibration Feature in return for an unbiased and fair review.
With 20+ years of experience with weather  instrumentation I honestly feel that the Ambient WS-26 is a better than average and fairly accurate instrument. (0^0)