This product is no longer available and has been replaced by: CR3000. Some accessories, replacement parts, or services may still be available.

Other Accessories

The 17160 is the 21X Operator's Manual in paper form (bound in a 3-ring binder).

Replacement Parts

The 905 Single 0.5-Unit Desiccant Bag is used to desiccate the inside of the 21X. Four bags are shipped inside of the 21X.
This wall charger can recharge the battery of a 21XL Micrologger via AC power. One end of the 16003 plugs into into an AC wall socket. On the other end, the charger has a barrel plug that attaches to the 21XL.
This sealed rechargeable battery is for 21XL bases with serial numbers greater than 3286 (the base serial number, NOT the serial number on the faceplate of the datalogger). The 6572 may also be used with 21X systems. The 6572 includes a single 12 V battery, lead, and connector.
The 425 provides one alkaline D cell battery.
The 6290 Phillips head screwdriver is commonly used to drive 505 screws into 6044 grommets.
The 1113 is used to attach sensor leads to screw terminals.
The 395 is available to replace a lost or damaged screw.
This type T, 5 in. thermocouple is attached to a differential channel on several of our datalogger wiring panels when the datalogger is shipped. It may be ordered to replace a lost or damaged thermocouple.


The 15844 is available only for 21X Microloggers that have previously passed Extended Temperature Testing. The 15841 requires concurrent purchase of the 16535 Recalibration and an RMA (Returned Material Authorization) from Campbell Scientific.
The 16087 allows a 21X with standard temperature testing to be returned to Campbell Scientific on an RMA to determine if it can pass Extended Temperature Testing. For the -55° to +80°C range, analog accuracies are derated approximately two times over published specifications. Extended temperature testing of a previously purchased unit also requires purchase of concurrent recalibration.
The 16535 recalibrates a 21X(L) Micrologger to meet original specifications. Before and after calibration sheets are supplied with the datalogger. An RMA (Returned Material Authorization) from Campbell Scientific is required. The calibration price assumes return of a fully functional datalogger; charges for all repairs will be added to the invoice.