Description
Kahl Scientific ML-450/B/UM Gemware Electro-V Psychrometer Hand-Electric w/ Case
The Kahl Scientific ML-450/B/UM is a Gemware Electro-V hand-electric psychrometer made by Kahl Scientific Instrument Corp. of El Cajon, California. A psychrometer measures relative humidity by comparing the readings of a wet-bulb and a dry-bulb thermometer; the Electro-V design uses a small electric motor to provide consistent airflow over the wet-bulb element, replacing the manual whirling action of a sling psychrometer and allowing repeatable, operator-independent readings. This unit was procured under a U.S. military contract and carries an NSN designation.
Specifications & What's Included
- Manufacturer: Kahl Scientific Instrument Corp., El Cajon, CA 92022 U.S.A.
- Model: ML-450/B/UM
- Trade Name: Gemware Electro-V
- Type: Psychrometer, Hand-Electric
- Measurement: Relative humidity via wet-bulb/dry-bulb thermometer pair
- Operation: Electric motor-driven airflow (hand-electric)
- NSN: 6685-00-590-8759
- Contract No.: DLA400-82-C-5945
- Form Factor: Handheld / portable
- Includes: Instrument and original olive-drab plastic storage case with metal latch and carry handle
Applications
Psychrometers of this type are used to measure ambient relative humidity in field, laboratory, and industrial settings. The hand-electric design was widely adopted by the U.S. military and government agencies for environmental monitoring — including HVAC commissioning, meteorological observation, storage facility compliance, and equipment environment verification — where consistent airflow over the wet bulb is critical for accurate readings. The Gemware Electro-V series was produced for military procurement contracts and saw use in a range of field and depot applications. These instruments remain useful today wherever a portable, non-electronic humidity reference measurement is needed, and they are also sought by collectors of vintage military test and measurement equipment.
This Kahl Scientific ML-450/B/UM Gemware Electro-V Hand-Electric Psychrometer has been inspected and appears to be in good used condition. The instrument body shows light scuffing and surface wear consistent with age and prior field or lab use. The thermometer slide rails and rotary knob appear intact and undamaged. The olive-drab plastic storage case is included and shows general wear with a functional latch. This unit has not been bench-tested at our facility. Please view our photo set and contact us if you have any questions. Please note: We have multiple units in stock — yours may not be the one shown in the photos, however, it will be similar in condition and function.
Warranty Information
Additional Information
Brand: |
Kahl Scientific Instrument Corp. |
Model: |
ML-450/B/UM |
MPN: |
ML-450/B/UM |
Type: |
Hand-Electric Psychrometer |
SKU: |
9613 |
NSN: |
6685-00-590-8759 |
Contract Number: |
DLA400-82-C-5945 |
Series / Trade Name: |
Gemware Electro-V |
Measurement Type: |
Relative Humidity / Wet & Dry Bulb Temperature |
Operation Type: |
Hand-Electric (battery or hand-powered motor) |
Form Factor: |
Handheld / Portable |
Includes: |
Instrument and original storage case |
Country/Region of Manufacture: |
United States |
Seller Notes: |
Includes original olive-drab plastic storage case with latch. |
Condition: |
Used – Inspected |
Condition Notes: |
Kahl Scientific ML-450/B/UM Gemware Electro-V Psychrometer inspected and in good used condition. Light scuffing and wear on body and case. Rotary knob and slide rails intact. Not bench-tested. Storage case included. |
