After updating Customers who are used to an old style read switch (red button) sometimes experience problems when they receive a newer loaner or after they get their updated instrument back from repair. They complain that it doesn’t read or measure consistently.
The current version switch has a grey rubber cap on it. The user needs to press firmly in the "middle" of the cap to hit and activate the switch. The new switch cap may be stiff for a short time until it is broken in.