The timer is intended for use with either one or two Wabash #331 Photogates (shown above timer but not included) on airtracks and pendulums.
The timer has two modes of operation. In mode one, the first beam interruption starts the timer and the next interruption stops the timer. It makes no difference on which of two possible photogates inputs they occur. In mode two, the timer measure the duration of the interruption. In this mode, however, one gate or the other must be selected. The total count available is 9.999 seconds in 1 millisecond increments with a crystal-controlled accuracy of +1 count. The count may be allowed to accumulate on successive starts or can be reset to zero with the pushbutton.
The display is red LED with half-inch numerals.
The tripod, post and clamp are not included.
Forensics Lab Supply Number 3178332.
Formerly Grau-Hall Corporation dba Grau-Hall Scientific.
Purchase orders may be sent by email to staff @ grauhall.com or by FAX to 916 379 9639 or by mail to P. O. Box 279592, Sacramento, CA 95827-9592.
All products shipped from Wabash, Indiana.