The display with backlight for easy viewing in low light conditions. The audible alert can be turned off if desired, and the counting function can be locked to prevent error during breaks between counting. The long life felt-tip markers (included) work on plastic or glass and are oil and water resistant. Ink marks are removable with ethyl alcohol.

• Marks and counts with an audible and visual alert
• Lightweight pen-style design reduces the likelihood of error
• Error further reduced by the ability to count both up and down to verify sample counts