The ADA4099-1 and ADA4099-2 are single/dual robust, precision, rail-to-rail input/output operational amplifiers (op amps) with inputs that operate from −VS to +VS and beyond...
The ADA4530-1 is a femtoampere (10−15 A) level input bias
current operational amplifier suitable for use as an electrometer
that also includes an integrated guard ...