Become a “speed reader” with this accurate, Clamshell Densitometer. Lift the “shell” and insert film, close the “shell” and press READ button. The measured optical display appears on the 3-digit liquid crystal display. The self-contained light source makes it convenient to use anywhere.

Range: 0.0 to 4.0 OD.
Accuracy: ±0.02D.
Reproducibility: = 0.01D.
Operating Temperature Range: 50°F to 104°F (10°C to 40°C).
Aperture: 2mm. Measuring Length: (Throat); 5.3 inches (135 mm).
Display: 3-digit, 5 in. LCD with polarity and low-battery indicator.
Zero Range: Auto zeroes to density 1.00.
Sensor: High efficiency silicon photodiode.
Controls:
(A) Zero pushbutton – automatically zeros unit
(B) Power ON/OFF switch.
(C) READ pushbutton-initiates READ sequence.
(D) Calibration control-screwdriver adjusted 20-turn potentio-meter to calibrate against a known step tablet.
Power: Four 1.5V AA batteries.
Size: 2.4"H x 3.2"W x 7.1"D.
Weight: 1 lb. 13 oz.

This unit has variable exposure time settings for blue and green-sensitive film. Just raise the platen, insert film, lower platen, push a button, and exposure is made. Features a 21 step density wedge with numbered 0.15D increments.

Specifications: Light Source: Dual-color electro luminescent. Blue 455nm ± 10nm; green 520nm ± 10nm.
Repeatability: ± 0.04D log exposure from unit to unit.
Stability: ± 0.02D log exposure per year at 10°C - 45°C.
Exposure Area: 21 steps, each 5mm x 10mm.
Tablet Densities: 0.05 to 3.05D in 0.15D increments.
Exposure Time: Adjustable, 50-500 ms typical. Exposure Adjustment: Separate screwdriver adjustments = 0.5D on each color. Controls: 1. Push-to-expose button with buzzer monitor and 2-second delay to prevent double exposures. 2. Blue/Green switch. 3. Power switch - none required. Unit draws no power on stand-by.
Power: Two 9V alkaline transistor batteries. MN1604 or equivalent. Optional AC power converter. Size: 7-5/8” L x 5-1/4” W x 3-5/8” H. Weight: 2 lbs.