Offered is a vintage Abbeon Certified Hygrometer And Temperature Indicator, Model HTAB169B in a brass case. We think it is from the 1960’s. It came from the collection of a vintage dial and gauge collector. It was made by Lufft in West Germany. It is untested.

From the manufacturer:

Abbeon Certified Hygrometer & Temperature Indicator West Germany HTAB169B Features:

• These hygrometers are certified to be accurate within ± 3 percent RH.

• The dial indicates the complete range of 0 to 100 percent relative humidity.

• Each instrument has been tested at three different positions of the dial at temperatures ranging from 32 to 230F.

• The large easy-to-read dial.

• The durotherm humidity sensor is certified to be accurate within ±3 percent RH.

• This sensor is constructed of a man-made fiber that expands and contracts as the humidity changes and mechanically linked through precision bearings and gears to the indicator.

• A calibration screw is accessible through a slot in the case for periodic calibration.

• The thermometer a bimetallic coil sensor and is accurate to 1 percent of scale.

• Available with a Brass or stainless-steel case perfect for indoor and outdoor use large easy-to-read 5-inch diameter dial case is drilled for wall mounting no batteries or external power source required tested at three different humidity positions.

Dimension/size – the face is a little more than 5” in diameter, about 5 ¾” with the mounting flange. It weighs 11 ounces.

Condition – this indicator is in very good condition. The back has some discoloration. We did attempt to polish it. Any purple tint you may see in the photos is a reflection from the camera.