| Extech Instruments Humidity Solution Kit with 33% and 75% Solution 33% and 75% Humidity Calibration Reference. Bottles designed with small opening for snugged fit of the sensor. Includes 33%RH and 75%RH calibration bottles. For use with Extech Models 42280, RH300, 445580, 445815 and CO250. Price Range: $66.29 to $232.99 |
| Merchant | Price |
|---|---|
 Optics Planet | $232.99 |