Jon worked in a soil testing lab and is aware of the most essential devices these technicians and scientists use. He brings this background into considerations when talking about:

• How to calibrate your instrument and reduce risk in the field.
• The importance of using calibrated equipment. What happens if you don't do this?
• Risk of temperature in the field on instrumentation.
• How was the instrument set-up that you purchased? Do you trust the calibration set-up by the manufacturer? What should you check? What happens when this is not done?