Caliber 4R Gold Digital Round Thermo-Hygrometer

Caliber 4R  Gold Digital Round Thermo-Hygrometer
Buy and earn 25 points valued at 0.25.
Log in
Fast Buy Log in to use
We won't be beaten on price! We will match any lower price found with any UK retailer. Just email details to and he will take care of it for you.

Description Ref # ACC-CALIBER4

This hygrometer utilizes the same sensor, circuitry and calibration as the Caliber IV. But in the shape of a traditional round design.

The classic looks of an analogue but powered by the advanced, accurate digital electronics of the Caliber line!

The Caliber 4R retains the legendary accuracy of Caliber digital hygrometers and are designed to eliminate gauge flutter with slow response updating time.

Caliber 4R displays both humidity and temperature readings, have the ability to record maximum and minimum readings and can be set to display in either Celsius and Fahrenheit scales.

Dimensions: front Diameter 55mm (2 ), Back diameter 50mm (2)

- Uses calibratable with easy to use digital set button
- ZX circuit technology prevents false readings
- Advanced humidity sensor maintains accuracy to +/- 1% @ 70% RH
- Fahrenheit/Celcius switchable
- High/Low memory for humidity and temperature
- New round design with secure magnetic mount


Displaying 1 to 5 (of 8 reviews)
Result Pages:  1  2  [Next >>] 
by Mark on Saturday 07 May, 2016
Not a review as such, more a question Ive noticed just now, as ive just received some cigars from c.gars and just put them in my Boveda Acrylic Humidor, that the temperature reading on my caliber IV Hygrometer seems to be jumping between 69 degrees F and 72 degrees F every now and then (although as i type it seems to have settled on 72 degrees F, As a new cigar smoker i'm a bit panicky about getting things right lol so wondered if this is normal or should i calibrate the hygrometer again? Also, is 72 a bit high temperature wise? Anyway, other than being unsure about that ive always been happy with the hygrometer.
by Daniel on Monday 04 January, 2016
Reliable, accurate and very easy to set up. I feel a lot more confident having it in the humidor.
by Staff on Monday 27 July, 2015
Similar to what I mentioned about the Caliber IV hygrometer, the 4R works in the same way delivering accuracy and precision. Although what's noticeably different is the style as it retains the traditional looks of an analogue hygrometer, but with the benefits of the updated digital features. If you like the Digital hygrometer but like the retro feel, pick one of these up!
by Staff on Monday 27 July, 2015
The Caliber IV is absolutely fantastic, what I like most about this hygrometer is the precision/accuracy, the digital display and it's slim but sleek profile design. Suitable to fit inside any travel/small desktop humidor. If you want an efficient and reliable digital hygrometer, pickup the Caliber IV (It's even supplied with the batteries!)
by Ross on Thursday 25 September, 2014
My first two purchases were the Xikar Hygrometer Rectangular version. On both of these Xikar hygrometers the tolerance is 2% either way whereas the Caliber IV is 1%. Both Xikars were not within specification using the Boveda Hygrometer Test kit. Bought a Caliber and popped it into the bag and within 24 hours it is reading bang on 75%, as it should. Both Xikars are being returned for the Caliber IV. Fantastic hygrometer with easy to read Relative Humidity (RH) and Temperature and on top of that you can alter the device if it does start to drift. Please don't make the same mistake I did. Go for one of these. You won't be disappointed!
Displaying 1 to 5 (of 8 reviews)
Result Pages:  1  2  [Next >>] 

Our Price Promise

We won't be beaten on price.

We will match any lower price found with any UK retailer. Just email details to and he will take care of it for you.


  • Order Online or by Phone: 07000 088 088
  • Orders placed by 2pm are despatched the same day
  • Next Working Day Delivery Available at the checkout for orders placed by 2pm (excludes selected products that may require special delivery arrangements as per product notes)